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3 years ago

13

A new CD ppayer costs $80. Ninny waits until it is 30% off to buy it. Find the amount that Minny pays for the new CD player befo

re tax.

1 answer:

Lyrx [107]3 years ago

8 0

She only paid $56 without tax

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How to calculate the Perimeter of a rectangle with length 7ft and width 3ft

Umnica [9.8K]

Answer:

Multiply each measurement by 2 then add them together

OR

Add 7 + 3 and multiply by 2

Step-by-step explanation:

Answer would be 20ft

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3 years ago

Compare numbers to their opposites based on their positions on a number line. Choose ALL true statements based on these comparis

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A, B, E

Step-by-step explanation:

I'm not too sure about B, but A and E are definitely true

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3 years ago

A quadratic function is a function of the form y=ax^2+bx+c where a, b, and c are constants. Given any 3 points in the plane, the

pochemuha

Answer:

The quadratic function whose graph contains these points is $y=-x^{2}-2x-2$

Step-by-step explanation:

We know that a quadratic function is a function of the form $y=ax^{2}+bx+c$ . The first step is use the 3 points given to write 3 equations to find the values of the constants <em>a</em>,<em>b</em>, and <em>c</em>.

Substitute the points (0,-2), (-5,-17), and (3,-17) into the general form of a quadratic function.

$-2=a*0^{2}+b*0+c\\c=-2$

$-17=a*-5^{2}+b*-5+c\\c=-25a+5b-17$

$-17=a*3^{2}+b*3+c\\ c=-9a-3b-17$

We can solve these system of equations by substitution

Substitute $c=-9a-3b-17$

$-9a-3b-17=25a+5b-17\\-9a-3b-17=-2$

Isolate a for the first equation

$-9a-3b-17=-25a+5b-17\\a=\frac{b}{2}$

Substitute $a=\frac{b}{2}$ into the second equation

$-9\left(-\frac{b}{2}\right)-3b-17=-2$

Find the value of b

$-9\left(-\frac{4b}{17}\right)-3b-17=-2\\ b=-2$

Find the value of a

$a=\frac{b}{2}\\ a=-1$

The solutions to the system of equations are:

b=-2,a=-1,c=-2

So the quadratic function whose graph contains these points is

$y=-x^{2}-2x-2$

As you can corroborate with the graph of this function.

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3 years ago

A boat can travel 112 miles on 14 gallons of gasoline. How much gasoline will it need to go 96 miles?

Oksi-84 [34.3K]

12. Divide 112 by 14 which comes to 8. Then take 96 and divide 96 by 8. Then you get 12

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3 years ago

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The side of a square is Two raised to the seven halves power inches. Using the area formula A = s2, determine the area of the sq

AlladinOne [14]

Answer:

Step-by-step explanation:

Area of a square = s²

s is the side length of the square

Given

s = 2^{7 1/2}

s = 2^15/2

Area = ( 2^15/2)²

Area = 2^15

Hence two area of the square is 2^15 inches

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2 years ago

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