What’s the angle for y?

y=42

Step-by-step explanation:

The sum of the angles of a triangle add to 180

y+ 48+ 90 = 180

The third angle is 90 because supplementary angles add to 180 and the other side is a 90 degree angle, which makes that angle equal to 90

y+ 48+ 90 = 180

Combine like terms

y +138 = 180

Subtract 138 from each side

y+138-138 = 180-138

y =42

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