Suppose we want to choose 2 letters, without replacement, from the 5 letters A, B, C, D, and E

the answer is a

step-by-step explanation:

because if you put 1 in to the square root of x it equals 300.

its totaly b

your welcome btw

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