Plug in 1 for n and solve, then plug in 2, and so on until you get to 3(6)-1=17
Answer:
6 mm
Step-by-step explanation:
Use the Pythagorean Theorem to solve for the unknown leg

Since we need to solve for a, we will manipulate the equation in terms of b and c → 
Here, b = 7 mm and c =
mm
Plugging these numbers into our equation gives us
→
=
= 6 mm
Answer: A.
They did not distribute the 3 to the 4 and -5a correctly.