The biggest problem with the results of this research study is B. Lack of realism.
What is realism about?It should be noted that when an experiment's procedures, participants, or setting are unrealistic. The ability of researchers to apply the findings of an experiment to the situations that hold the most interest may be constrained by a lack of realism.
The study is how how noise impacts student performance on exams is being proposed.
An experiment's subjects, medications, or environment might not accurately replicate the circumstances we truly wish to explore. In that circumstance, we are unable to extrapolate the experiment's findings broadly.
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The options are:
a. Lack of attention to experimental detail
b. Lack of realism
c. Placebo effect
2. Find the parabola with equation y = ax² + bx whose tangent line at (1, 1) has equation y = 3x - 2.
Answer:
Step-by-step explanation:
Three students were scheduled to give book reports in 1 hour.
After the first report, 2/3 hour remained (HINT: this means the first persons' report was 1/3 of an hour)
The next report took 1/6 hour. What fraction remained?
The fraction of hour that remained is 1/2 hour.
It is given in the question that three students were scheduled to give book reports in 1 hour.
After the first report, 2/3 hour remained. The next report took 1/6 hour.
We have to find the fraction of hour that remained.
We know that,
Total time for reports = time taken for first report + time taken for second report + time remained for third report
Hence, we can write,
Time taken for first report = 1-2/3 = 1/3 hour
Time taken for second report = 1/6 hour
1 = 1/3 + 1/6 + time remained for third report
1 = 2/6 + 1/6 + time remained for third report
1 = 3/6 + time remained for third report
1-3/6 = time remained for third report
3/6 = 1/2 = time remained for third report
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Which expression is equivalent to quantity y raised to the negative second power times z raised to the seventh power end quantity over quantity z raised to the negative third power times y raised to the eighth power end quantity all raised to the negative second power? z raised to the tenth power over y raised to the tenth power y raised to the tenth power over z raised to the tenth power z raised to the twentieth power over y raised to the twentieth power y raised to the twentieth power over z raised to the twentieth power
The expression z raised to the twentieth power over y raised to the twentieth power is equivalent to the expression given in the question.
y raised to the negative second power = [tex]y^{-2}[/tex]
z raised to the seventh power = [tex]z^{7}[/tex]
Thus, in the numerator we have the expression- [tex]y^{-2} z^{7}[/tex]
In the denominator, we will have-
z raised to the negative third power = [tex]z^{-3}[/tex]
y raised to the eighth power = [tex]y^{8}[/tex]
denominator will be = [tex]z^{-3} y^{8}[/tex]
Thus, the expression becomes-
[tex](\frac{y^{-2 }z^{7} }{z^{-3} y^{8} })^{-2}[/tex]
Now, that we've decoded the expression, let us solve it-
[tex]({y^{-2 }y^{-8} z^{7} z^{3} )^{-2}[/tex]
= [tex]({y^{(-2-8) } z^{(7+3)})^{-2}[/tex]
= [tex]({y^{(-10) } z^{(10)})^{-2}[/tex]
= [tex]{y^{(-10*-2) } z^{(10*-2)}[/tex]
= [tex]{y^{(20) } z^{(-20)}[/tex]
= [tex]\frac{z^{20} }{y^{20} }[/tex]
= [tex](\frac{z}{y} )^{20}[/tex]
Thus, the expression z raised to the twentieth power over y raised to the twentieth power is equivalent to the expression given in the question above.
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A leaky faucet drips 1/4 fluid ounce of water every 20 minutes. How many Gallons of water will leak from this faucet in 1 year? (Round to the nearest gal.)
Answer:
51
Step-by-step explanation:
I may have made a mistake somewhere along the way but if not then it is 51 gallons.
The way i did this was to multiply 20 minutes by 3 to equal an hour, then multiply that by 24 to equal a day, then multiply that by 365 to equal a year.
That gives you the numbers you need to multiply the ounce by. So first multiply 1/4 by 3 to get 3/4. Next you multiply 3/4 by 24 to get 72/4 or 18. Then you multiply 18 by 365 to get 6570 ounces in a year. Finally you translate that to gallons and you get 51.328125, which rounds down to 51.
Alsooo, i wouldnt mind a good old brainliest if im correct :)
simplify 3x + 5y - x + 2y
Answer:
2x + 7y
Step-by-step explanation:
3x + 5y - x + 2y ← collect like terms
= (3x - x) + (5y + 2y)
= 2x + 7y
By Simplifying 3x + 5y - x + 2y, we get 2x + 7y
More Explanation
The simplification here follows the basic method of addition and subtraction in algebra.
Given : 3x + 5y - x + 2y
Step 1: align the numbers with similar variables.
Therefore, we get, 3x - x + 5y + 2y
Step 2: Solve by addition and subtraction.
Therefore, we get, 2x + 7y
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The large of two numbers is less than 3 times the small number if the sum of the numbers is 35 find the numbers
The numbers are 26 and 9 respectively.
What is an algebraic expression?An algebraic expression can best be defined as an arithmetic or mathematical expression that is known to consist of variables, coefficients, constants, factors as well as terms.
These expressions said to contain numerous arithmetic operations, which includes;
SubtractionBracketParenthesesMultiplicationAdditionDivision, with others inclusive.From the information given, we have that
Let the small number be x
The large number be y
y < 3x (1)
Also,
x + y = 35 equation 2
x = 35 - y
Substitute the value of x in equation 1
y < 3(35 - y)
expand the bracket
y < 105 - 3y
collect like terms
y + 3y < 105
4y < 105
Make 'y' the subject
y < 105/4
y < 26. 25
y = 26
substitute the value of y
x + y = 35
x + 26 = 35
x = 9
Hence, the values are 26 and 9
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Sort the following transformations according to whether or not they preserve distances.
Preserves Distance
Does NOT Preserve Distance
A. Counter-clockwise rotation about the origin
B. A dilation of 1/5
C. A translation that moves a figure up 5 units
D. A reflection over the y-axis
E. A dilation of -4
The truth statements about the transformations are:
A. Counter-clockwise rotation about the origin ⇒ PreserveB. A dilation of 1/5 ⇒ Do not preserveC. A translation that moves a figure up 5 units ⇒ PreserveD. A reflection over the y-axis ⇒ PreserveE. A dilation of -4 ⇒ Do not preserveHow to determine the category of the transformation?There are four types of transformation, and they are:
DilationRotationReflectionTranslationThe representation of the types of transformation are:
Dilation: k(x, y)Rotation: rotation by anglesReflection: reflection across linesTranslation: (x + h, y + k)Of the above transformation, only the dilation transformation do not preserve side lengths or distance
Hence, the categories of the transformations are
(a), (c) and (d) ⇒ Preserve
(b) and (e) ⇒ Do not preserve
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A truck can be rented from Company A for $40 a day plus $0.40 per mile. Company B charges $20 a day plus $0.50 per mile to rent the same truck. Find the number of miles in a day at which the rental costs for Company A and Company B are the same.
The number of miles in day at which the rental cost for the company A and Company B are the same is 200 miles
The Company A rented the truck for $40 a day plus $0.40 per miles
The expression will be
40+0.40x
Where x is the number of miles
The company B rented the truck for $20 a day plus $0.50 per miles
20+0.50x
To find the number of miles in a day at which the rental costs for Company A and Company B are the same, the linear equation will be
40+0.40x = 20+0.50x
40-20 = 0.50x-0.40x
0.1x = 20
x = 200 miles
Hence, the number of miles in day at which the rental cost for the company A and Company B are the same is 200 miles
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Alyssa wants to play the game. Choose the statement below that is correct in all aspects. E(penny) = –0.33 and E(nickel) = 0.33, so she should play with the nickels. E(penny) = 0.5 and E(nickel) = 1.5, so she should play with the nickels. E(penny) = 1.75 and E(nickel) = 1.5, so she should play with the pennies. E(penny) = 2.38 and E(nickel) = 2, so she should play with the pennies
Using the expected value of a discrete distribution, the correct option is given as follows:
E(penny) = 1.75 and E(nickel) = 1.5, so she should play with the pennies.
What is the expected value of a discrete distribution?The expected value of a discrete distribution is given by the sum of each outcome multiplied by it's respective probability.
When 3 coins are tossed, the probabilities are given as follows:
All heads: (1/2)^3 = 0.125.All tails: (1/2)^3 = 0.125.At least one of each: 1 - 2(0.125) = 0.75.Hence the distribution for the penny points is:
P(X = -2) = 0.25.P(X = 3) = 0.75.The expected value for the penny points is:
-2 x 0.25 + 3 x 0.75 = 1.75.
When 2 coins are tossed, the probabilities are given as follows:
All heads: (1/2)² = 0.25.All tails: (1/2)² = 0.25.At least one of each: 1 - 2(0.25) = 0.50.Hence the distribution for the nickel points is:
P(X = -2) = 0.5.P(X = 5) = 0.5.The expected value of nickel points is:
E(X) = -2 x 0.5 + 5 x 0.5 = 1.5.
Due to the higher expected value, she should play with the pennies and the third option is correct.
What is the missing information?
The complete problem is given by the image at the end of the answer;
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Answer:
The answer is C
Step-by-step explanation:
edge
1/4 Marks
a) Complete the prime factor trees for 16 and 40:
16
b)
2
2
8
2
4
17/31 Marks
2
2
40
What is the Lowest Common Multiple of 16 and 40?
82%
5
Answer:
Answer in photo!!! :))
Step-by-step explanation:
is the algebraic expression t^2/t^4 equivalent to t^2?
Answer: no
Step-by-step explanation:
t^2/t^4 is 1/t^2 which is not t^2
what is 3 +7x(2+9x) simplify as a expression
Q= (R-M) over 2
R-M/2
R= 21
M= 15
The image best explains, I cannot math and math cannot me, please I need help.
Answer:
3
Step-by-step explanation:
(21-15)/2
6/2
= 3
......
Answer:
3
Step-by-step explanation:
substitute the numbers into the equation Q= (21-15)/2
you then start with the numbers within the parathesis: 21 - 15 = 6
then divide it by 2: 6/2 = 3
answer: Q = 3
Write the formula for a meal that has a total cost of C
that is equal to the price of the food F plus 20% (for tip) of
the price of the food.
Answer:
C = F(0.20) + F
Step-by-step explanation:
C is the total cost. F(0.20) will reduce the value of the food to the tip amount required, and then adds the tip value to the price of the food, F.
Example inputs: let F be equal to 10
C = F(0.20) + F turns into C = 10(0.20) + 10
10(0.20) will cause 10 to be multiplied by the tip value, 20%, and 20% is equivalent to 0.20. Once you multiply 10 by 0.20, you get 2. After that, you add 2 to the price of food, which is 10, and you get a total cost of 12.
12 = 10(0.20) + 10
The weather forecast for the weekend is a 35% chance of rain on Saturday and a 65% chance of rain on Sunday. Your friend says that means there is a 100% chance of rain this weekend. What error did your friend make?
Answer:
Because these probabilities are independent, the friend was supposed to multiply them, not add them. So the probability of rain this weekend is
.35 × .65, or .2275, meaning that the probability of rain this weekend is 22.75%
56x raise to power minos 4 divided by 14x raise to power minos 8
56x raise to power minus 4 divided by 14x raise to power minus 8 has its answer calculated as 4[tex]x^2[/tex] by solving through formulas of exponents and powers.
What are exponents?A mark placed exactly or right above a mathematical equation or a numeral that helps to denote the action of raising to a power of something.
Exponent is also defined as one of the methods of expressing many large numbers in terms of powers. This means that exponent refers to how many times a single number or an equation is multiplied by itself.
The statement 56x raise to power minus 4 divided by 14x raise to power minus 8 can be simplified in equational terms as
[tex]\frac{56x^-{4}}{14x^{-8}}[/tex]
which can be further simplified as [tex]4x^{4}[/tex]
What does the term Exponentiation stand for?Exponentiation is a type of mathematical operation that can be written as bⁿ, involving two numbers. The base b and then the exponent or power n is included in it and pronounced as "b to the power n".
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Complete the sentence below.
35 280 is ten times bigger than
Answer:
3528
Step-by-step explanation:
35280 divided by 10 is 3528. To check your work, multiply 3528 by 10. The answer is 35280.
Hope this helps! :)
What is 40÷8175 PLEASE HELP ME H E L P
Answer:
Step-by-step explanation: 0.00489296636 if you divided by 40 to 8175 but if you wanted 8175 divided 40 it would equal 204.375 just letting you know i used a calculator so if these aren't it then i'm not sure
17. The area of the rectangle shown exceeds the area of the square by
2 cm². Find x.
y
X
x-1
18. The area of the square exceeds the area of the rectangle by 13 m².
Find y.
X
x + 2
y
X
y + 1
19. The area of the square is half the area of the rectangle. Find x.
y-3
2(x + 4)
(x - 2)
The values of the missing variables from the areas of rectangle and square are;
17) x = 4
18) y = 5
19) x = 4
What is the area of the rectangle and square?17) The formula for area of rectangle is;
A = Length * Width
Formula for area of square is;
A = side * side
Thus;
A_rect = (x - 1)(x + 2) = x² + x - 2
A_sq = x²
The area of the rectangle shown exceeds the area of the square by
2 cm². Thus;
x² + x - 2 - x² = 2
x - 2 = 2
x = 4
18) Area of the square; A_sq = y²
Area of the rectangle; A_rect = (y - 3)(y + 1) = y² - 2y - 3
The area of the square exceeds the area of the rectangle by 13 m². Thus;
y² - y² + 2y + 3 = 13
2y = 10
y = 5
19) The area of the square is half the area of the rectangle. Thus;
x² = ¹/₂(2(x² + 2x - 8))
x² = x² + 2x - 8
2x - 8 = 0
x = 4
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are 5x^2 and -9x^2 like terms
true or false
Answer:
true
Step-by-step explanation:
when unlike terms are added, they cannot be "combined".
examples of unlike terms: [tex]2x +3[/tex] and [tex]5y - 2[/tex] and [tex]6y^2 - 4x^2[/tex]
[tex]5x^2 and -9x^2[/tex] are like terms because they both contain the variable x and have an exponent of 2.
assume the cost of a gallon of milk is $2.70. with continuous compounding, find the time it would take the cost to be 4 times as much (to the nearest tenth of a year), at an annual inflation rate of 6%.
The time it would take the cost to be 4 times the current cost of a gallon of milk at an annual inflation rate of 6% is calculated to be 23.8 years.
To determine the time for the cost to be 4 times the current cost of a gallon of milk, we use the compound interest formula as follows;
A(t) = A(0) (1 + r)^t
Here A(t) is the cost of 4 times the current cost at time t
A(0) is the current cost
r is the interest rate
t is the time period
Therefore;
2.70 × 4 = 2.70( 1 + 0.06)^t
2.70 × 4 / 2.70 = (1.06)^t
4 = (1.06)^t
Taking log on both sides;
t × log(1.06) = log 4
t = log 4 / log(1.06)
t = 23.791 = 23.8 years
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a vendor sells hot dogs and bags of potato chips. a customer buys 3 hot dogs and 3 bags of potatochips for $8.25. another customer buys 5 hot dogs and 3 bags of potato chips for $11.25. find thecost of each item.
Cost of one hot dog is and potato chips is
As per the given problem a customer buys 3 hot dogs and 3 bags of potato chips for $8.25. we have to find the cost of each item.
let price of one hot dog is x nd price of potato chips is y.
Formulating the Equation we get
3x+3y=$8.25
another customer buys 5 hot dogs and 3 bags of potato chips for $11.25.
Formulting the Equation we get
5x+3y=$11.25.
we get two linear equation with two unknowns.
solving both equation we get $8.25-3x=$11.25-5x
or 2x=$3
x=$1.5
y=$1.25
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Sandeep is making fruit dip for a party. His recipe calls for 1/2 of a teaspoon of cinnamon and 3/4 of a cup
of yogurt. Using this ratio, how much cinnamon does Sandeep need if he uses 3 cups of yogurt?
2 teaspoon of cinnamon need if he uses 3 cups of yogurt
What is ratio ?By comparing two amounts of the same units, the ratio can be used to calculate how much of one item is included in the other. There are two different categories for ratios. The first is a part to part ratio, whereas the second is a part to whole ratio. The relationship between two separate entities or organizations is shown by the part-to-part ratio. For instance, a class has a 12:15 boy-to-girl ratio, whereas the part-to-whole ratio describes how one group compares to another. For instance, five people enjoy reading books out of every ten persons. Since the ratio of the component to the total is 5:10, 5 out of every 10 persons enjoy reading.
Given that :Sandeep is making fruit dip for a party. His recipe calls for 1/2 of a teaspoon of cinnamon and 3/4 of a cup
of yogurt.
[tex]0.5 : 0.75 = x : 3[/tex]
x = 2
2 teaspoon of cinnamon need if he uses 3 cups of yogurt
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Evaluate the exponential expression: (y 3/xy 2)²=_______, if x = 2 and y = 6.
1. 9
2. 36/144
3. 6/144
4. 15
The value of the exponential expressions is 9. Option 1
What is an algebraic expressions?
An algebraic expression can be defined as an expression that is composed of coefficients, variables, terms, constants, and also factors.
These expressions may also consist of arithmetic or mathematical operations such as;
ParenthesesMultiplicationDivisionSubtractionBracketAddition, etcGiven the exponential expression as;
(y³/xy²)²
For when x = 2 and y = 6
We have to substitute the value into the expression, we have;
{(6³/(2)(6)²)}
Find the cube and square of the values, we have;
{ 216/2(36) }²
expand the bracket
{ 216/72}²
Find the quotient
{3}²
Find the square
9
Hence, the value is 9
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How many was the phone before the discounted price?
Answer: depends how many you have with you
Step-by-step explanation:
does not matter how many you have
subtract the quotiet of 70 divided by 2 from 60
The algebraic representation of the expression "subtract the quotiet of 70 divided by 2 from 60" is 60 - 70/2" which gives the result 25
Algebraic representation of expressionQuotient means the result obtained from the division of an expressionThe divisor is the expression or term used to divide the expressionThe dividend is the expression being divided by another expression.the quotiet of 70 divided by 2
= 70/2
subtract the quotiet of 70 divided by 2 from 60
= 60 - 70/2
= 60 - 35
= 25
In conclusion, the result of the expression "subtract the quotiet of 70 divided by 2 from 60" is 25
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convert -20°C to degrees Fahrenheit using the formula F = 9/5C + 32. (F=9/5(-20)+32)
Answer:
- 4° F
Step-by-step explanation:
substitute C = - 20 into the formula
F = ([tex]\frac{9}{5}[/tex] × - 20 ) + 32 = (9 × - 4) + 32 = - 36 + 32 = - 4° F
reciprocal of b-1/b
FOR A RECIPROCAL OF FRACTION WE SWAP POSITIONS. WHATEVER WAS IN THE NUMERATOR BECOMES THE DENOMINATOR AND WHAT WAS IN THE DENOMINATOR BECOMES THE NUMERATOR.
THIS MEANS THAT AS A RESULTS WE HAVE
[tex] \frac{b}{b - 1} [/tex]
ATTACHED IS THE SOLUTION.
find the values of k for which the line y = 2x + k + 2 cuts the curve y = 2x^2 + (k + 2)x + 8 at two distinct points.
The values of k for which the line y = 2x + k + 2 cuts the curve y = 2x² + (k + 2) + 8 at two distinct points are; k > -12 or k < 4
What is the point of Intersection of the line and the curve?We are given the equation of the line as;
y = 2x + k + 2
Equation of the curve is;
y = 2x² + (k + 2) + 8
Now, to find the the values of k for which the line y = 2x + k + 2 cuts the curve y = 2x² + (k + 2) + 8 at two distinct points, we will just equate both equations to get;
2x + k + 2 = 2x² + (k + 2) + 8
2x + k + 2 = 2x² + kx + 2x + 8
2x² + kx + (-k + 6) = 0
Now, Two distinct solutions is the same as having a positive discriminant.
b² - 4ac > 0
k² - 4(2 * (-k + 6)) > 0
k² + 8k - 48 > 0
Solving using quadratic equation calculator gives;
k > -12 or k < 4
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Evaluate the expression. 12−{1+2[−1(3−8)]2} What is the value of the expression? Enter your answer in the box.
If the given mathematical expression 12−{1+2[−1(3−8)]2} is been evaluated , then it will become -18.
How can the expression be simplified?The mathematical expression can be simplified by first simplify the expression in the inner bracket one after the other.
The given mathematical expression is 12−{1+2[−1(3−8)]2}
then we can simplify one after the order by following the bracket one after the other, as :
12−{1+2[−1(3−8)]2}
12 - {1+2[-1(-5)]2}
Then we can further simplify the expression as :
12 - {3 [ 5 ] 2}
Then this can be further simplified as :
12 - {30}
This can be further simplified as :
-18
Therefore, the value of the expression given is -18
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