Answer:
1081
Step-by-step explanation:
Answer:
Composition: 
Domain = {
}
Step-by-step explanation:
Given

The requested composition becomes:

Then the Domain consists of all Real x-values for which the function is defined. In this case, the function is defined for all x-values for which the square root is defined, that is all x values for which:
(so the square root is defined in the Real number system)
This means 
The Domain is then all the Real x-values such that 
Answer:
x = 17.2
Step-by-step explanation:
cos 35 = x/21
0.8192 = x/21
x = 17.2
Marcus ran 43.74 miles.
Take 90% of 48.6 miles by multiplying .90 by 48.6
48.6(.90)=43.74 miles