Andrew is practicing for a tennis tournamnet and needs more tennis balls. he bought 10 cans of tennis balls online and received a 25% discount . the shipping cost was $5.99.let x representthe cost of each can .

The cost of each tennis ball can = $7.99

Step-by-step explanation:

Here, the number of tennis ball  cans purchased =10

The overall discount = 25%

The reduced price of each ball can  = $5.99

⇒ The reduced price of 10 cans   =  10  x ( reduced price of each ball can)

                                                        = 10 x ($5.99)  = $59.90

Now, let us assume the cost of each ball can = x

So, the cost of 10 ball can = 10 times x = 10 x

Also, The reduced amount = Cost of 10 cans -Reduced maount of 10 cans

                                             = 10 x  -  $59.90

⇒ 25% of 10 x  = 10 x  -  $59.90

⇒

or, x = 7.99

Hence, the cost of each tennis ball can = $7.99

f

step-by-step explanation:

f

(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