Please help me I need to turn in tomorrow

B. 5

Step-by-step explanation:

Combination

It's a selection of items from a collection, such that the order of selection does not matter.

It can be calculated by using factorials with the formula:

Let's calculate:

Since 5!=5*4! and 1!=1:

Simplifying:

B. 5

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