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Ede4ka [16]
2 years ago
15

He cost, c, of a health club membership is related linearly to its length in months, m. If a 12-month membership costs $260 and

an 18-month membership costs $380, which equation can be used to find the cost of a 30-month membership?
A) c - 380 = 1/20(30-18)
B) c - 18 = 20(380-30)
C) c - 380 = 20(30-18)
D) c - 18 = 20(30-12)
Mathematics
2 answers:
alexdok [17]2 years ago
6 0

Answer:

The answer is c

Step-by-step explanation:

got it right on edge

Lynna [10]2 years ago
5 0
Treat the c formula as a line. c = sm +b; where m= number of months.

using the two examples: 

260 = 12s +b
380 = 18s + b
solve for s & b:
s = 20
b =20

So a 30-month membership is:

c = 20(30) + 20 = 600

Solve C for c and you get 600
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