What is the product of 7/8 x 4/7

1/2

Step-by-step explanation:

7x4= 28

8x7= 56

simplify: 28/56=1/2

7/8  x  4/21

(7x4)/(8x21)=28/168

Let's divide the top and bottom by 7...

(28/7)/(168/7)=4/24

Let's divide the top and bottom by 4...

1/6

Step-by-step explanation:

hope this helps have a great night❤️❤️❤️❤️

(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