The laptop screen turns off when the angle between the keyboard and the screen is less than 20°. How many more degrees can the laptop screen close before the screen turns off? The laptop screen can close ?° more before the screen turns off

40⁰

Step-by-step explanation:

z+40+z-20=180

2z+20=180

2z=160

z=80

z-20=80-20=60

the laptop screen of in 60-20=40⁰

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

it has to have an angle of 90 degrees