Use the special right triangle to evaluate sin 45°, cos 45° and tan 45°. your answers should be exact (not a decimal).
a. sin 45 = √2/2, cos 45 = √2/2, tan 45 = 1
b. sin 45 = 1, cos 45 = 1, tan 45 = √2/2
c. sin 45 = 1/2, cos 45 = √3/2, tan 45 = √3
d. sin 45 = 0, cos 45 = 1, tan 45 = 0

she played for 18.75 hours.

step-by-step explanation:

if she played 2/4 of a hour on tuesday. and there is 60 minutes in an hour and 60 divided by 4 is 7.5. and she played 2/4 of an hour on thursday then again 60 divided by 4 is 7.5, you add 7.5+7.5=56.25. now you have to do 1/4 of an hour, it equals 3.75. now you have to add them all up. 3.75+7.5+7.5=18.75

i hope this and i hope you get it right. it took me a while to get this done for you. : )