The table shows the battery life of four different mobile phones: mobile phone battery lifephone battery life (hours) a 20 b 25 c 10 d 18 if 8.45% of the battery life of each mobile phone is used in a day by a typical user, which mobile phone would use a total of 1.69 hours of battery life in a day? phone a phone b phone c phone d

The answer would be 20

A

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

5 + 8 +7 + 4 + 0 +1 = 25

step-by-step explanation: