Answer: you can use 260 min, 60 min at a fixed price ($20) and extra 200.
Step-by-step explanation:
C(x) = 20 + 0.20(x − 60)
C(x) ≤ 60
20 + 0.20(x − 60) ≤ 60
0.20(x − 60) ≤ 60 - 20
0.20x - 12 ≤ 40
0.20x ≤ 40 + 12
0.20x ≤ 52
x ≤ 52/0.2
x ≤ 260
This way, you can use 260 min, 60 min at a fixed price ($20) and extra 200.

There are pi radians in 180 degrees. Therefore to convert degrees to radians we need to divide by 180 and multiply by pi, as follows:
That is an ratio, what are you asking for??
The answer would <span>be <span>3250</span>.</span>
Answer:
k = 2.
Step-by-step explanation:
j = c/k where c is a constant.
When k = 3, j = 12 so
12 = c/3
c = 36.
So the relation is j = 36/k
When j = 18
18 = 36 / k
So 18k = 36
k = 2.