Question

The function f(x) = 3.45x + 12 relates how much Catherine pays for electricity service, f(x), to the number of Units of power, x, she uses in a month. What is the value and meaning of f(2)?

$30.09; this is the amount Catherine pays for 2 units of power in 1 month.

$30.09; this is the amount Catherine pays for 2 units of power in 12 months.

$18.90; this is the amount Catherine pays for 2 units of power in 1 month.

$18.90; this is the amount Catherine pays for 2 units of power in 12 months.

Answer 1

we have that
f(x) = 3.45x + 12

substitute for x=2
f(2)=3.45*2+12-------> f(2)=$18.90/month

$18.90 is the amount, that Catherine pays for 2 units of power in 1 month

therefore

the answer is the option
$18.90; this is the amount Catherine pays for 2 units of power in 1 month.