Customers of a phone company can choose between two service plans for long distance calls. The first plan has no monthly fee but charges $0.18 for each minute of calls. The second plan has a $23 monthly fee and charges an additional $0.13 for each minute of calls. For how many minutes of calls will the costs of the two plans be equal?

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,

a) 0

step-by-step explanation:

i^413 x i^0 = 0 as any number multiplied by a zero is

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this is a good question! i'll do some research and come back when i have the answer!