Plz help. i’ll give brainliest

Your answer is 128

Step-by-step explanation:

Summary of Work:

 310

 140

−012

 128

Step by Step:

Working each column from right to left

 140

−012

2 is greater than 0 so you must regroup:

Take 1 from 4, so 4 becomes 3.

Add 10 to 0, so 0 becomes 10.

 310

 140

−012

10 minus 2 is 8

 310

 140

−012

   8

3 minus 1 is 2

 310

 140

−012

 28

1 minus 0 is 1

 310

 140

−012

 128

x=157

first add up x+12and 124

add two times

and cancel with 2 it gives you 157

Step-by-step explanation:

a

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