Please answer, right answer = brainliest.

no

Step-by-step explanation:

to find out whether a triangle is a right triangle we can use the pythagorean theorem

a²+b²=c²

a= one side of the triangle

b= one side of the triangle

c= the hypotenuse (or biggest side )

21^2+ 72^2= 76^2

441+ 5184= 5776

5625 = 5776  X

since the sums do not equal this means that it is not a right triangle.

i hope this helps!!

pay attention in your classes and concentrate the best thing you can do to raise your test scores is to pay attention when you're supposed to be learning the material: in class!

take good notes.

do your homework.

use mnemonics and other tricks.

do practice tests.

note: the best i know.

x is greater than 5

step-by-step explanation:

2x+7 is greater than 17

    -7                           -7

2x is greater than 10

divide by 2 each side

x is greater than 5