Elevation above sea level = 2x+50
rock climbers minute of climbing = x
2x + x + 50
3x + 50
The equation of any given circle is:

where (h, k) is the center and r is the radius.
In the problem, we are given the center, and the radius. When we plug them in:

we got the formula of the circle.
Answer:
C)
Step-by-step explanation:
A magician never tells there secret
For 1. The bike is going 24 miles in 3 hours. To figure out how many miles it went in 1 hour you divide 24/3 which is 8 miles. If the bike went 8 miles per hour then you may now multiply it by 10 to find the total mileage in 10 hours. 10x8=80