An office supply store sells pencils individually or by the case. pencils purchased individually cost $0.97 each. one case of forty pencils costs $37.20. purchasing pencils by the case rather than individually saves _ per pencil.
$0.93
$0.97
$0.04
$36.23

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

20 feet per second

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-lavira : )