Answer: (5,2)
Step-by-step explanation:
Given equations: 
Divide 2 on both sides of equation (1) and 4 on the both sides of equation (2), we get

Adding equation (3) and (4), we get

Substitute x=5 in equation (4), we get

Hence, the solution of the both equations is (5,2).
Answer:
12cm.
Step-by-step explanation:
The radius is half of a circe.
6 * 2 = 12.
Answer:
B.
4x+9 = 2x-1
Step-by-step explanation:
Answer:
.35 miles per minute
3.5 miles in 10 minutes
Step-by-step explanation:
21 ÷ 60= .35
.35 × 10 = 3.5