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5.7.PS 15
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Mario bought 60 feet of wire for $13.80. He needs 20 more feet. If the unit price is the same, how
much will he pay for the extra 20 feet of wire?

He will pay 60 feet of wire for $13.80

b. 6

step-by-step explanation:

we are given the table representing an exponential function.

we can see from the table that, as x is increasing, the value of y is increasing in the power of 6.

i.e. the following relation is obtained,

x = 1, y = 6

x = 2, y = 36 =

x = 3, y = 216 =

x = 4, y = 1296 =

x = 5, y = 7776 =

so, the geometric series obtained is .

thus, the common ratio is given by = = 6.

hence, the common ratio is 6.