Solve the problem. See Examples 7 and 8.
Long distance charges. The function L = 0.10n + 4.95 gives the monthly bill in dollars for AT&T’s one-rate plan, where n is the number of minutes of long distance used during the month.
a) Find n if the long distance charge is $23.45.
b) Find L for 120 minutes.
c) Estimate the L-intercept from the accompanying graph.
d) Use the formula to find the L-intercept.
e) Use the formula to find the n-intercept.
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