Answer:
17
Step-by-step explanation:
f(x) = 3x + 2
Let x=5
f(5) = 3*5 + 2
Multiply first
= 15+2
Then add
= 17
9
You gave the answer right in your question
7x w x 13=546
(7x13)*w= 546
91w=546
91w/91= 546/91
w= 6
the width is 6cm