Answer:
2 1/4
Step-by-step explanation:
Number 1 is incorrect because 1/4 x 9 is 2 1/4 not 1 1/4.
To multiply fractions, multiply directly across. So multiply 1/4 x 9/1 to get 9/4 which converted into a mixed number is 2 1/4.
Answer:
He was incorrect
Step-by-step explanation:
3x+5(3x+6)
multiply whats inside the parenthesis by whats outside
3x+15+30
he forgot to multiply 6x5 too.
Answer:
Pythagorean theorem 
Step-by-step explanation:

Answer:
x=11/9 hope this helped <3
Step-by-step explanation:
Let's solve your equation step-by-step.
34x+2x=44
Step 1: Simplify both sides of the equation.
34x+2x=44
(34x+2x)=44(Combine Like Terms)
36x=44
36x=44
Step 2: Divide both sides by 36.