Someone needed to complete eight math problems and her dad said that she could take a break once she had finished 40% of it and she finished 3 problems so can she take a break

no

Step-by-step explanation:

use the proportion:

is/of = %/100

x/8 = 40/100

320 = 100x

divide by 100

x = 3.2 problems

she needs to do 3.2 problems. 3 is not enough.

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