A bookstore costs $90 a day to keep open, and spends $12 for each book it
sells. The store charges $18 for each book it sells. If n represents the number
of books sold, which equation represents the cost function for this
bookstore?
O
A. C= 12n + 90
O B. C= 18n+90
O C. C= 90n +15
O D. C= 90n+ 12

step-by-step explanation:

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x=0

step-by-step explanation:

answer: cos [   arcsin (3/5) - arccos (1/2) ] =

step-by-step explanation: × = 3/5 = 0.6--> x = 36.87 and x = 180 - 36.87 = 143.13 deg

cos y = 1/2 --> y = +- 60 deg a. cos (x - y) = cos (143.13 - 60) = cos 83,13  

=

0.12

b. cos (36.87 - 60) = cos (-23.23) = 0.92