Answer:
A
Step-by-step explanation:
Use pythagorean theorem: a^2+b^2=c^2
12^2+x^2=13^2
144+x^2=169
x^2=25
x=5
HTH :)
Answer:
10
Step-by-step explanation:
Plug in 2 for x.
f(2) = 3·(2)²-2
=3·4-2
=12-2
=10
I could better help if I knew the question.....
Answer:
Two times the sum of a number and nine.
Step-by-step explanation: