It takes 12 hours to clean the windows of a certain office building. during the
first day of cleaning, the workers were able to clean for 9 hours. if the variable
t stands for the amount of time the workers have left to clean the windows,
which of the following units could apply to this variable?

a. buildings
b. hours
c windows

pretty sure it is B bc it saud t stands for ant if time left

yes. we do proportions in probabilities.

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