Please can someone help with this question? I will mark brainliest!

1

Step-by-step explanation:

ok, so just first, plug a and b into the equation to get:

.

Then do the squares in the denominator to get

then we change the fractions in the denominator to get a common denominator, to get: then we add the fractions to get: . 1409/100 = 14.09, and we simplify the number to .

10/14.09 ≈ 1, so that's your answer

Hope this helps! :D

step-by-step explanation:

i am not sure sorry : c

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.