It takes 3.5 minutes to upload 12 photographs from a smart phone to a computer and then an additional 1.25 minutes to upload the photographs to a website. At this rate, about how long will it take to upload 20 photographs from a smart phone to a computer and then to a website? A. about 7.2 minutes
B. about 5.8 minutes
C. about 2.1 minutes
D. about 7.9 minutes

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

what are you trying find out?

step-by-step explanation:

that one look

step-by-step explanation:

answer: need a picture

step-by-step explanation: