I need help thank you

and

Step-by-step explanation:

Given

Required

The domain

Set the denominator to not equal to 0

Also, the expression in roots must be 0 or positive i.e

Hence, the domain is defined for:

and

(3x-8) or (3x+8)

step-by-step explanation:

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.