Nadine ordered t-shirts for her chess club from a website. Each shirt is $10.95 and Nadine
has a coupon for $12.50 off her total order.
You must number and answer each of the following questions completely
and accurately.
A. What quantities change in this situation? Define a variable for each.
B. What quantities remain the same? Define a variable if necessary.
c. Write an equation, using the variables you defined in questions A and B,
to describe this situation.
D. Use the equation you wrote in question C to determine how many t-
shirts Nadine ordered if her total cost was $151.75.
A. Your work must demonstrate the properties of equality used to solve
the equation.

no one knows lol

step-by-step explanation:

(b) 240

step-by-step explanation:

first, we use the pythagorean formula using the given side lengths to find x. then we use x to find the side lengths. then we add the side lengths to find the perimeter.

pythagorean theorem formula:

a^2 + b^2 = c^2

(x - 20)^2 + (x - 40)^2 = x^2

x^2 - 40x + 400 + x^2 - 80x + 1600 = x^2

x^2 -120x + 2000 = 0

(x - 100)(x - 20) = 0

x - 100 = 0 or x - 20 = 0

x = 100 or x = 20

we see that the solution x = 20 must be discarded because it will give a negative side length and a side length of 0. the only valid solution is x = 100.

perimeter = sum of the lengths of the sides

perimeter = x + x - 20 + x - 40

perimeter = 3x - 60

replace x with 100.

perimeter = 3(100) - 60

perimeter = 300 - 60

perimeter = 240