Answer:
12a
Step-by-step explanation:
Use the distributive property and distribute 3 into 4a.
The expanded form of the expression 3(4a) is, 12a.
What are the basic properties of arithmetic laws of operations?There are three types of basic arithmetic laws of operation.
Commutative law for addition and multiplication states,
a + b = b + a.
a×b = b×a.
Distributive law states,
a(b ± c) = ab ± ac.
Associative law states,
a + (b + c) = (a + b) + c.
Given, An expression 3(4a),
We know in algebra we write multiplications a×b as, ab or a.b.
Therefore, the expanded form of the expression 3(4a) is,
= 3×4×a.
= 12×a.
= 12a.
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Suppose that a population parameter is 0.7 and many samples are taken from the population. If the size of each sample is 100, what is the standard error of the distribution of sample proportions?
Answer: .046
Step-by-step explanation: I just had this question
The statement : "for a sample size of n = 26 and a population parameter of p = 0.6, a normal curve can be used to approximate the sampling distribution" is true.
What is normal curve?Normal curve is used to represent the class shapes in the statistical probability. Mathematically, we can describe the normal curve as -
[tex]$f(x)= {\frac{1}{\sigma\sqrt{2\pi}}}e^{- {\frac {1}{2}} (\frac {x-\mu}{\sigma})^2}[/tex]
where -
f(x) = probability density function
σ = standard deviation
μ = mean
Given is that for a sample size of n = 26 and a population parameter of
p = 0.6, a normal curve can be used to approximate the sampling
distribution.
It is asked to identify whether the given statement regarding the normal curve is true or false. The given statement is - "for a sample size of n = 26 and a population parameter of p = 0.6, a normal curve can be used to approximate the sampling distribution". The given statement is true.
Therefore, the statement : "for a sample size of n = 26 and a population parameter of p = 0.6, a normal curve can be used to approximate the sampling distribution" is true.
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Select the correct answer. What is the domain of y=cos(x)? PLEASE HELP
y = cos (x) y = cos (x) The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined.
Cos function defines in all range the domain of the y = cos(x) will be all real number.
What is a trigonometric function?The domain input value for the six basic trigonometric operations is the angle of a right triangle, and the result is a range of numbers.
The trigonometric function is only valid for the right angle triangle and it is 6 functions which are given as sin cos tan cosec sec cot.
It will be possible to comprehend the graphs, domains, differentiation, and integration of the four quadrants' trigonometric functions.
The domain of the function y=cos(x) is all real numbers.
Cosine is defined as any angle measure
The range of the angle y will be -1 to 1 which is −1≤y≤1.
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When Natalie runs the 400 meter dash, her finishing times are normally distributed with a mean of 71 seconds and a standard deviation of 2.5 seconds. What percentage of races will her finishing time be between 71 and 77 seconds, to the nearest tenth?
Answer:
49.2%
Step-by-step explanation:
If the door to the library is at (2, 4), the door to the mall is at (8, 2), and one square unit equals one square mile, the approximate distance between the library and the mall is miles, when measured door to door.
Please help best answer will get brainly
Answer:
https://ihomeworkhelpers.com/mathematics/question512843765
Step-by-step explanation:
MRK ME BRAINLIEST PLZZZZZZZZZZZZZZ
that link is not fake its is a homework helper site if it doesn't works let me know
Answer: 126.66 m²
Step-by-step explanation: The pertinent area formula is a = πr², where r is the radius. here, a = π(6.35 m)² = 40.32π, or approximately 126.66 m²
FIRST PERSON TO ANSWER CORRECTLY GET MARKED BRAINLY
Answer:
[tex]-\frac{14}{25}[/tex]
Step-by-step explanation:
I took the test. (iready)
What is the measure of angle 1?
Write a sine function that has an amplitude of 5, a midline of 2 and a period of 8pi/5.
Answer:
f(x) = 5*sin( (5/4)*x) + 2
Step-by-step explanation:
A general sine function can be written as:
f(x) = A*sin(w*x) + M
Where:
A is the amplitude
w is the frequency of the function
M is the midline
Here we know that we want to have:
An amplitude of 5. Then, A = 5
A midline of 2, then M = 2
And a period of (8/5)*pi
For now, we can write our function as:
f(x) = 5*sin(w*x) + 2
Now, we know that for a function of period T, is always true that:
f(x) = f(x + T)
here, the period is T = (8/5)*pi
knowing that sin(0) = sin(2*pi)
Then we must have:
sin(0) = sin(w*0) = sin(w*( 0 + (8/5)*pi)) = sin(2*pi)
Then the arguments of the third and fourt parts must be the same, thus:
w*(8/5)*pi = 2*pi
We can solve this for w now:
w*(8/5) = 2
w = 2*(5/8) = (5/4)
Then the function is:
f(x) = 5*sin( (5/4)*x) + 2
I will be giving brainliest whoever answers these
Answer:
3, 5, 1, -1, 5, -1, -1, 5
Step-by-step explanation:
Because it is I am tired sorry
what is the x intercept of the graph of y=4x-36
Answer:
36
Step-by-step explanation:
My explanation to this is that if you look at the problem it will show you 36.
Answer:
9
Step-by-step explanation:
To find the x-intercept, set y = 0
0 = 4x-36
Add 36 to both sides:
0+36 = 4x-36+36
36 = 4x
Divide by 4 on both sides:
36/4 = 4x/4
9 = x
The x-intercept is 9
How much elastic energy is stored in a slingshot that has a spring constant of 300 N/m and is stretched by 0.45m?
Answer:
135
Step-by-step explanation:
Answer: HURRY I need it quick and will give Brainliest Which value of x satisfies the equation StartFraction 12 over StartRoot x plus 2 EndRoot EndFraction plus 8 equals 10?
Answer:
D
Step-by-step explanation:
President Obama wrote a children's book about extraordinary Americans. One of those
Americans was Albert Einstein. One of Einstein's equations is shown below. Rearrange the
equation to solve for c
E = mc² where Eis energy, m is mass, and c is the speed of light
A) c = (E2 - m)1/2
B) c = E - m2
C) c = (E/m) 1/2
D) c = Em2
Help #1-4 please please just add the symbol addition , subtraction , multiplication or division . I tried 1.subtraction 2&3 division & 4 multiplication but they are wrong so please help
Problem 1
Operation = Subtraction
Estimated answer = 8 dollars
----------------------------
Explanation:
The regular price is estimated at $45, while the sale price is estimated at $37. The two subtract to get 45-37 = 8 dollars, which is about how much you save if you go for the discount price.
The actual amount saved is 45.32-36.50 = 8.82
==========================================================
Problem 2
Operation = Division
Estimated answer = 75 cents
----------------------------
Explanation:
$3.45 rounds to $3
Divide this over 4 to get 3/4 = 0.75, meaning each battery is 75 cents
The actual cost per battery is 3.45/4 = 0.86 dollars = 86 cents.
==========================================================
Problem 3
Operation = Division
Estimated answer = $10
----------------------------
Explanation:
Round $37.45 to the nearest ten to get $40; we could round to 37 but that's an oddball number in my opinion compared to 40. Plus 40 is divisible by 4, leading to 40/4 = 10. Each person chips in about 10 dollars.
The actual amount each person pays is 37.45/4 = 9.36
==========================================================
Problem 4
Operation = Multiplication
Estimated answer = 180 miles
----------------------------
Explanation:
18.75 rounds to 20, which we multiply by 9 to get 180
So the car can travel about 180 miles on 9 gallons. This is an overestimate because 18.75 rounded up to 20
The actual value is 18.75*9 = 168.75
4. Find Percent Change:
Original Price $50
New Price $60
Answer:
20% change
Step-by-step explanation:
20 percent of 50 is 10. 50+10=60.
Brainliest please?
XxRoadToAcexX
PLEASE HELP WILL MARK BRAINLIEST
Emily is painting every side of the door to her bedroom. The door is a rectangular prism with a length of 35 in, a width of 3 inches and a height of 65 inches.
What is the total amount of space that Emily will cover with paint?
1. 5,150 square inches
2. 6,096 square inches
3. 6,852 square inches
4. 8,002 square inches
Which temperature is lower
a)-9°C or -10°C
-10°C is lower than -9°C
Step-by-step explanation:
-10°C is lower than -9°C
The more the temperature increase the more heat increases
Thus, -10°C is lower than -9°C
-TheUnknownScientist
Answer:
Step-by-step explana
-10
Can someone help me please because I really don’t understand
Answer:
All skelts have at least one right angle.
Step-by-step explanation:
All skelts have 5 sides. (false, one have 6 sides)
All skelts are convex figures = outline curved like the exterior of a circle (false, none of them have curvy outline like a circle)
All skelts have an odd number of sides. (false, one have 6 sides, which is an even number)
Help !!!!!!!!!!!!!!!!!!!!!
Answer:
sorry but I am not able to answer the question
In the first week of July, a record 1,020 people went to the local swimming pool. In the second week, 125 fewer people went to the pool than in the first week. In the third week, 145 more people went to the pool than in the second week. In the fourth week, 224 fewer people went to the pool than in the third week. What is the percent decrease in the number of people who went to the pool over these four weeks?
Answer:
The percent decrease in the number of people who went to the pool over these four weeks was of 20%.
Step-by-step explanation:
Percent decrease:
The percent decrease is the decrease multiplied by 100 and divided by the initial value.
Decrease was of:
Second week: - 125
Third week: - 125 + 145
Fourth week: -125 + 145 - 224 = -204
Decrease was of 204.
Percent decrease:
Initially 1,020, then a decrease of 204. So
204*100%/1020 = 20%
The percent decrease in the number of people who went to the pool over these four weeks was of 20%.
Answer: 20%
Step-by-step explanation: jst trust me im gang frl nd i wont get it wrong i promi
what is 4 2/5 - 1 1/4 how would you get the answer
Step 1 [tex]4\frac{2}{5}-1\frac{1}{4}[/tex]
Step 2 [tex]4\frac{2*4}{5*4} - 1 \frac{1*5}{4*5}[/tex]
Step 3 [tex]4 \frac{8}{20} - 1 \frac{4}{20}[/tex]
Step 4a [tex]4 - 1 = 3[/tex]
Step 4b [tex]\frac{8}{20} - \frac{4}{20} = \frac{4:4}{20:4} = \frac{1}{5}[/tex]
Step 5 (final answer) [tex]3\frac{1}{5}[/tex]
Chelsea bought a computer on Monday for $1,300. Its value is predicted to decrease by $250 per year. Her brother George also bought a computer on Monday. The function g(x) = 1,100 – 175x predicts how the value of his computer is expected to change after x years.
Whose computer is expected to have a greater value when it is 3 years old, and how much greater will it be?
A) Chelsea’s computer is expected to have a value of $25 greater.
B) George’s computer is expected to have a value of $25 greater.
C) Chelsea’s computer is expected to have a value of $125 greater.
D) George’s computer is expected to have a value of $125 greater.
Answer:
The correct answer is B. George’s computer is expected to have a value of $25 greater.
Step-by-step explanation:
Since Chelsea bought a computer on Monday for $ 1,300, and its value is predicted to decrease by $ 250 per year, while her brother George also bought a computer on Monday, and the function g (x) = 1,100 - 175x predicts how the value of his computer is expected to change after x years, to determine whose computer is expected to have a greater value when it is 3 years old, and how much greater will it be, the following calculation must be performed:
Chelsea:
1,300 - (250 x 3) = X
1,300 - 750 = X
550 = X
George:
1,100 - (175 x 3) = X
1,100 - 525 = X
575 = X
Therefore, George’s computer is expected to have a value of $ 25 greater.
Last year, Deshaun had $10,000 to invest. He invested some of it in an account that paid 8% simple interest per year, and
he invested the rest in an account that paid 6% simple interest per year. After one year, he received a total of $660 in
Interest. How much did he invest in each account?
Note that the ALEKS graphing calculator can be used to make computations easier.
Answer:
4
Step-by-step explanation:
The length of the base of an isosceles triangle is 8 yards. The height of the triangle is 11 yards. Find the area of the triangle.
Answer:
A=44yd²
Step-by-step explanation:
PLEASE HELP ME 8 NEED THIS FPR A TEST TMRW
12 ly
Which statement is true regarding the functions on the
graph?
10
8
-6
4
919
Of(6) = g(3)
O f(3) = g(3)
Of(3) = g(6)
Of(6) = g(6)
-6-
2
3 4 5 6 x
4 -3 -2 -12
- fix
-6
-8
-10
-12
Answer: f(3)=g(3)
Step-by-step explanation:
The graphs intersect at x = 3.
The statement "f(6) = g(3)" is true.The correct option is A.
What is a graph?A graph is a structure that amounts to a set of items where some pairs of objects are in some manner "related" in discrete mathematics, more specifically in graph theory.
From the graph, we can see that the value of f(6) is 2, and the value of g(3) is also 2.
The statement "f(3) = g(3)" may or may not be true, as we do not know the values of f(3) and g(3) from the graph.
The statement "f(3) = g(6)" is not true, as the value of f(3) on the graph is -2, and the value of g(6) is 4.
The statement "f(6) = g(6)" is also not true, as the value of f(6) on the graph is 2, and the value of g(6) is 4.
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which statement abou y= 7x2 + 23x + 6 is true
24427 correct to the nearest 1000
Answer:
24427 correct to the nearest 1000? 24000.
Step-by-step explanation:
So 24000 is your answer.
What is the area of a circle with a radius of 13 millimeters? (use 3.14 for pi)
===============================================
Work Shown:
A = pi*r^2
A = 3.14*13^2
A = 3.14*169
A = 530.66 square millimeters
We can abbreviate "square millimeters" into "square mm" or into "mm^2".
This value is approximate because pi = 3.14 is approximate.
y=−8x−3
x+y=7
Is (3,4) a solution of the system?
Answer:
No
Step-by-step explanation:
The given point does not satisfy the first equation.
y = -8(3) -3 = -27
4 ≠ -27 . . . . . the first equation is not satisfied.
Answer: No
Step-by-step explanation:
Plug x and y into y=-8x-3 and calculate:
4 = -24 - 3
4 ≠ 27
Therefore (3,4) is not a solution of the system of equations.