The tennis club charges $10 an hour for members (m) and $20 an hour for guests (g). What is the hourly rate (r) if a group of 4
members and 8 guests want to use the club?

The answer is: $200.  If 4  members and 8 guests wanted to use the club, it would cost $200 an hour.

m = members, and g = guests

m costs $10/hr

g costs $20/hr

You must multiply the cost/hour by the quanity of the variable.

So, you could set up and solve the equation as:

10(m) + 20(g) = r

10(4) + 20(8) = r

40 + 160 = r

200 = r

Therefore, the answer is $200.

first, we define the variables:

x: number of years after 1950

f (x): amount of vinyl sold.

then, with the variables defined, we have:

68594 vinyl records were sold in 1958 > f (8) = 68594

91299 vinyl records were sold in 1961 > f (11) = 91299

38720 vinyl records were sold in 1952 > f (2) = 38720

161743 vinyl records were sold in 1967 > f (17) = 161743

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