Hello. Ik im going to get a warning for this and it will get reported but, I DO have a question. Do u think my math teacher will get susspisous if i get all three test 100% bc i been using Also math is my WORST subject but i still get A's in it. wut'da think?? Should i learn the real math or wut. i think i should learn the real math tho

He probably won't get too suspicious if you get 100% on three quizzes when you regularly get A's in that class.  A ninety-something percent jump to a 100 is less than a 10-point increase.  

That being said, it's still best to learn the math so that you don't become dependent on using for every question.  Maybe only use it when you're having a lot of trouble with a particular problem or concept; but some of the explanations on here are actually really helpful in teaching things.

(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