Since trevon bought one package for 3 dollars than 3 x 21 equals 63
Answer = 21
I suppose you mean to have the entire numerator under the square root?

We can use a trigonometric substitution to start:

Then for
,
; for
,
. So the integral is equivalent to

We can write

so the integral becomes

Answer:
We don't know that they skew but if Q and R are the same length then they aren't. But if Q and R are different lengths then they are skew. It would help to post a picture.
Step-by-step explanation:
Answer:
90
Step-by-step explanation:
0.9 multiplied by 100 to turn it into a percentage is 90.