The errors made by the student are:
The variables y and x are not properly swappedThe square root should include the ± signThe domain of the function is incorrectHow to identify the errors?The equation is given as:
[tex]y = x^2 + 12x[/tex]
The first step of the student is given as:
[tex]x = y^2 + 12x[/tex]
This is incorrect because the variables x and y must be completely swapped.
So, the actual step is [tex]x = y^2 + 12y[/tex]
The second step is given as:
[tex]y^2 = x - 12x[/tex]
The third step is given as:
[tex]y^2 = - 11x[/tex]
The last step is given as:
[tex]y = \sqrt{-11x}[/tex] for [tex]x \ge 0[/tex]
This is incorrect because [tex]y = \sqrt{-11x}[/tex] would have complex solution for [tex]x \ge 0[/tex] and the square root needs to have a ±
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If the diameter of a youth softball is 3.5 inches and the diameter of an adult softball is 3.8 inches, what is the approximate difference in their volumes? use 3.14 for pi. round to the nearest tenth of a cubic inch. recall the formula sphere volume = four-thirds pi r cubed. 6.3 cubic inches 51.1 cubic inches 67.0 cubic inches 409.2 cubic inches
Answer:
A because the volume of the adult softball is 28.7309120146 inches and the youth softball is 22.4492975038 inches and when u subtract them u get about 6.3 cubic inches :)
Step-by-step explanation:
:)
Answer: IT A!
Step-by-step explanation:
19. What are equivalent statements to a + 3 = 18 and 4 b = 32?
a = 18-3 and b = 32/4
a=18/3 and b = 32/4
a = 18/3 and b = 32-4
a = 18-3 and b = 32 - 4
Answer:
The choice second . a=18/3 and b = 32/4
Step-by-step explanation:
[tex]a + 3 = 18 \\ a = 18 - 3[/tex]
[tex]4b = 32 \\ \\ b = \frac{32}{4} [/tex]
The question is in the picture.
Answer:
x² - 22x + y² + 18y + 58 = 0
Step-by-step explanation:
Using the equation of a circle :
(x - h)² + (y - k)² = r²
Solving :
Substitute 11, -9, 12 in place of h, k and r respectively.
(x - 11)² + (y + 9)² = (12)²x² - 22x + 121 + y² + 18y + 81 = 144x² - 22x + y² + 18y + 202 = 144x² - 22x + y² + 18y + 58 = 0Measure the angle shown below.
a protractor showing an angle going through the fifteenth tick mark after two hundred sixty five degrees
272°
275°
279°
280°
The measure of the angle shown is 280°
Calculating anglesFrom the question, we are to determine the measure of the angle shown
For the given protractor,
The measure between any two lines is 10°.
Also, there are 10 tick marks between any two lines.
∴ 15 tick marks will have a measure of 15°
Then,
The measure of a protractor showing an angle going through the fifteenth tick mark after two hundred sixty five degrees will be
265° + 15° = 280°
Hence, the measure of the angle shown is 280°
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Solve for x.
Question 12 options:
A)
12
B)
11
C)
13
D)
10
Answer:
A
Step-by-step explanation:
You have to use intercept theorem, also known as Thales's theorem to slove
24. Taylor wants to purchase an $80 purse. She has
found three stores that have the purse originally priced
at $80 but are offering 3 different sales this weekend:
1
●
Store A: off original price
• Store B: 10% off original price
Store C: $15 off original price
Which of the following is a true statement?
Answer:
we need the full question
Graph the lines that represent the following system of linear equations.
2s +1.5y = -60
2s + y = -50
The lines that represent the following system of linear equations.
2s +1.5y = -60
2s + y = -50
will intersect at (-15, -20)
What is the equation of line?The equation of a straight line is a relationship between x and y coordinates, The general equation of a straight line is y = mx + c, where m is the slope of the line and c is the y-intercept.
Slope is a ratio of change in y-coordinate w.r.t. change in x-coordinate. The net change in y coordinate is written as, Δy and the net change in x coordinate is written as, Δx.
Given,
System of linear equations
2s +1.5y = -60
2s + y = -50
After plotting both the graphs we can see that, point of intersection is (-15, -20)
Hence, The point of intersection is (-15, -20)
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Choose the best definition for the following phrase: combining like terms (1 point)
Group of answer choices
A letter that holds the place for some unknown value in mathematics
A process where you must look for terms that have identical variable parts and then combine their coefficients
A process where if two things are equal, one can be put in the place of the other and nothing will change
Terms that have identical variable parts
Answer:
A process where you must look for terms that have identical variable parts and then combine their coefficients
Step-by-step explanation:
Combining like terms is adding or subtracting terms that have the same variable parts.
Answer: A process where you must look for terms that have identical variable parts and then combine their coefficients
At the grocery store, apples are one price and chocolate bars are another. mary buys three apples and one chocolate bar for $2.70. bill buys one apple and 4 chocolate bars for $6.40. write a system of equations to model mary's and bill's purchases and then determine the cost of a chocolate bar.
Answer:
Step-by-step explanation:
Step 1 is to collect the information in a table format. The attached Table1 summarizes what we know in columns 1 - 3. Columns 4 - 6 show the data we're about to calculate, so ignore them for the moment.
.I use A for the price of one apple and C for the price of 1 chocolate bar. We know how many of each are purchased by both Mary and Bill, and the total each paid.
The last column (6) shows the price for each, which comes from the derivation presented below.
We can set the information in columns 1 - 3 into equations:
Mary: 3A+1C = 2.70 [This states that Mary bought 3 apples at a price of A for each apple, and 1 chocolate bar at a price of C per bar.]
Bill: 1A + 4C = 6.40 [In the same fashion, this summarizes how Bill parted with his $6.40]
---
Now let's rearrange either equation to solve for C. I'll use Mary's equation:
3A+1C = 2.70
1C = 2.70 - 3A
This tells us that the price of 1 chocolate bar is $2.70 minus the cost of 3 apples. Interesting, but we need the price of a chocolate bar to determine an exact amount.
----
Now take Bill's equation and substitute the value we just derived for the price of a chocolate bar C = (2.70-3A).
1A + 4C = 6.40
1A + 4(2.70 - 3A) = 6.40
1A + 10.80 - 12A = 6.40
-11A = -4.40
A = 0.40 This is the price for 1 apple. This is the value in the last column (6) of attached Table1.
---
Now we can use the value of $0.40 in either equation to find the price of a chocolate bar. I'll use the rearranged equation we developed for Mary:
1C = 2.70 - 3A
1C = 2.70 - 3(0.40) [A = 0.40 from the above work]
1C = 2.70 - 1.20
1C = 1.50
The price of 1 chocolate bar is $1.50. Pricey, and bad for health. But very tasty.
Columns 4 and 5 are the total costs for the apples and bars bought by each, and their sums add up to the amounts we were given at the start of the problem. So our prices must be correct.
Solve the system of equations.
5x-4y=-10
y=2x-5
x=_____
y=_____
Answer:
Step-by-step explanation:
5x - 4(2x - 5) = -10
5x - 8x + 20 = -10
-3x = -30
x = 10
y = 2(10) - 5 = 20 - 5 = 15
(10, 15)
Tom opens a bank account and makes an initial deposit of 500$. Then banker tells Tom that he is going to receive an annual rate of 6% on his investment. Find the bank balance assuming Tom leaves the account untouched for 15 years. (Will give brainliest to the person who has the answer correct and will shown work.)
[tex]~~~~~~ \textit{Compound Interest Earned Amount} \\\\ A=P\left(1+\frac{r}{n}\right)^{nt} \quad \begin{cases} A=\textit{accumulated amount}\\ P=\textit{original amount deposited}\dotfill &\$500\\ r=rate\to 6\%\to \frac{6}{100}\dotfill &0.06\\ n= \begin{array}{llll} \textit{times it compounds per year}\\ \textit{annually, thus once} \end{array}\dotfill &1\\ t=years\dotfill &15 \end{cases} \\\\\\ A=500\left(1+\frac{0.06}{1}\right)^{1\cdot 15}\implies A=500(1.06)^{15}\implies A\approx 1198.28[/tex]
Solve the following quadratic equation for all values of x in simplest form.
10-3x²=-2
Answer:
x = ± 2
Step-by-step explanation:
10 - 3x² = - 2 ( subtract 10 from both sides )
- 3x² = - 12 ( divide both sides by - 3 )
x² = 4 ( take square root of both sides )
x = ± [tex]\sqrt{4}[/tex] = ± 2
then x = - 2, x = 2
Answer:
x=2,-2
Step-by-step explanation:
10-3[tex]x^2\\[/tex]=-2
Can also be written as 12=3[tex]x^2[/tex]
[tex](12=3x^2)/3[/tex]
[tex]4=x^2\\\sqrt{4} =+-\sqrt{x^2} \\[/tex]
2=+-x or x=2,-2
x=2,-2
Please help !!!!!!!!!!
Answer:
the third option in the list
Step-by-step explanation:
the numbers down below qre the coefficients of the equations above
Let f(x)=√9x and g(x) = x + 7.
What’s the smallest number that is in the domain of fog
f(g(x))
√9(x+7)√9x+63The smallest no for the domain is -63 as square root of a negative no not possible.
For -63
√-63+630Answer:
x = -7
Step-by-step explanation:
[tex]\begin{aligned}f \circ g=f[g(x)] & = \sqrt{9(x+7)}\\& = \sqrt{9}\sqrt{x+7}\\ & = 3\sqrt{x+7}\end{aligned}[/tex]
Domain = input values (x-values)
As we cannot square root a negative number, the domain is:
x ≥ -7 → [-7, ∞)
Therefore, the smallest number that is in the domain of [tex]f \circ g[/tex] is -7
1/2x +3x = 14
steps?
Answer: Heyaa! ~
Your Answer would be.. =4
Step-by-step explanation:
Solve for x by simplifying both sides of the equation, then isolating the variable.Convert the integer into a fraction:Combine the fractions:Combine the numerators:Multiply both sides by inverse fraction 2/7:Group like terms:Simplify the fraction:Multiply the fractions:Simplify the arithmetic:Hopefully this helps you ! ^^
Find the measures of angles a=(2x+3) and b=(2x-3),if their sum is 120 degrees
Answer:
angle A is 63 degrees,
angle B is 57 degrees
Step-by-step explanation:
first, let's create the equation. Pretty simple, because angles a and b become 120 degrees when added up, this this will become:
2x+3+2x-3=120
now, we make it simpler. In this case, just add up the numbers that we can add up. this eventually becomes:
4x=120
now, all we need to do is divide 120 by 4, which becomes 30. So, x=30.
substitute the 30 into the x in the original equation, and this becomes:
60+3+60-3=120
63+57=120
thus, angle A is 63 degrees, and angle b is 57 degrees.
Please help me with this PROBABILITY question! I'm really stuck and would really appreciate your help.
Please don't post nonsense answers and I'd love it if you could add working out.
Thanks :))
Answer: The probability of picking a black bead is 4/7, because there are 4 black beads out of seven. But if you took the first black bead out of the equation then the probability is now 3/7.
Write an equation and find how much longer it would take to fly against the wind than
with it between New York and Los Angeles if the wind speed increases to 150 miles per
hour and the airspeed of the jet is 525 miles per hour. Round to the nearest hundredth.
The time taken by the jet will be equal to 6.58 hours.
What is speed?Speed is defined as the ratio of the time distance traveled by the body to the time taken by the body to cover the distance.
Given that:-
Assume that the distance between New York and Los Angeles is 2468 miles.The speed of wind is 150 miles per hour.The speed of the jet is 525 miles per hour.The time taken by the jet will be calculated as:-
Average speed = 525 - 150 = 375 miles per hour.
The time is taken to cover the distance of 2468 miles will be:-
Time = 2468 / 375 = 6.58 hours.
Therefore time taken by the jet will be equal to 6.58 hours.
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Karla and Jeremy have cicular pool with a diameter of 14 feet. what is the circumference of the pool? Use 3.14 = 22/7
Answer:
43.96 feet
Step-by-step explanation:
The formula for the circumference of a pool is π*diameter or 2*π*radius.
Therefore, since the diameter is 14, 14*3.14= 43.96
what is 9x7 equal to i been stuck
Answer:
9x7=63
Step-by-step explanation:
just use a calculator for multiplication
The product of 9 and 7 is 63. In other words, the result of multiplying 9 and 7 is 63.
To find the result of multiplying 9 and 7, by follow a step-by-step process.
First, start by writing the multiplication expression as 9 multiplied by 7.
Next, multiply the digit in the ones place of the first number (9) with the digit in the ones place of the second number (7).
In this case, 9 multiplied by 7 equals 63.
Then, move to the tens place of the second number (7) and multiply it with the digit in the ones place of the first number (9).
Since there is no digit in the tens place of the first number, skip this step.
Finally, add the products obtained from the previous steps.
In this case, there is only one product, which is 63.
Therefore, the result of multiplying 9 and 7 is 63.
Multiplication is a fundamental arithmetic operation used to determine the total value when a number is repeated a certain number of times. In this case, multiplying 9 by 7 represents adding nine 7s together.
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PLEASE ANSWER. the question and the options r in the picture.
Answer:
the answer is 5 got it right on quiz
Answer: E
Reason:
The tip of the right whisker is the max value. This is assuming there aren't any large outliers.
3 divided by 3.40 i am sorry
. The taxi charged $3.50 for a ride plus $1.75 per mile. How many complete miles could Gale travel for $30 if she left a $6 tip? A. 10 B. 11 C. 12 D. 13
Answer:
answer would be.. B= 11 miles
solve the quadractic formula 3x+x-3=0
Answer: x = 0.75
Step-by-step explanation:
3x+x - 3 =0
4x - 3=0
4x = 3
x = 0.75
Nathan has 40 coins.Of coins,1/5 are nickels,1/5 are dimes,and the rest are quarters.What Is the ratio of Nathan’s nickels to dimes to quarters?
The ratio of Nathan's nickels to dimes to quarters is 4 : 4 : 17.
What is the ratio ?Ratio expresses the relationship between two or more numbers. It shows the number of times that one value is contained within other value(s).
Number of dimes = 1/5 x 40 = 8 Number of nickels = 1/5 x 40 = 8 Number of quarters = 40 - 8 - 8 = 34The ratio = 8 : 8 : 34 = 4 : 4 : 17
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wyatt has a square garden. he adds 3 feet to one side and 1 foot to the other and now it is a rectangle with an area of ft^2 what are the new dimensions of the garden
Answer:
The new dimensions are 6 ft and 4 ft.
Step-by-step explanation:
Let x = side of original square.
The sides are increased by 3 ft and 1 ft, so the new side lengths of the rectangle are
x + 3 and x + 1
The area of the rectangle is length × width.
area = (x + 3)(x + 1)
area = x² + 4x + 3
The area is 24 ft².
x² + 4x + 3 = 24
x² + 4x - 21 = 0
(x + 7)(x - 3) = 0
x + 7 = 0 or x - 3 = 0
x = -7 or x = 3
x + 3 = 3 + 3 = 6
x + 1 = 3 + 1 = 4
The new dimensions are 6 ft and 4 ft.
What is the polynomials of (2x^2-x+1)(x-3)
Answer:
2x^3 - 7x^2 + 4x - 3
Step-by-step explanation:
Multiply them all together.
Mike is adding 145 and 237. his work is shown. how can mike find the sum?
Answer:the answer is 352
Step-by-step explanation: mike can find the sum by adding the two numbers 145+237=352 to make it simpler you can start by adding the hundreds then the tens and then the ones.
Expand and simplify
4(2x + 3) + 4(3x + 2)
Answer: 20x + 20
Step-by-step explanation:
We will distribute the four into the expressions to expand, then we will simplify.
Given:
4(2x + 3) + 4(3x + 2)
Distribute:
8x + 12 + 12x + 8
Combine like terms with addition:
20x + 20
20x + 20
Colin gets pic 'n mix when at the cinema and makes his bag up with 3 types of sweet. He picks 3 times as many cola bottles as smarties. He also picks twice as many smarties as marshmallows. What proportion of the bag of sweets are cola bottles?
Give your answer in its simplest form.
The simplest form of the proportion is 2/3
here , it is give that colin picks 3 times as many cola bottles as smarties and twice as many smarties as marshmallows. To simplify this let us suppose colin pic a number of marshmallows then number of smarties he pic will be 2a and also the number of cola bottles will be 6a.
What is proportion ?
A proportion is an equation based on the equality of two ratios.
Therefore, the proportion of the bag of sweets are cola bottles will be :
[tex]\begin{aligned}\frac{6a}{a+2a+6a}&=\frac{6}{9}\\&=\frac{2}{3}\end{aligned}[/tex]
Therefore, The simplest form of the proportion is 2/3
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