Answer:

Step-by-step explanation:
Given: 
We have to find the value of 
Since Given 
Using trigonometric identity,

Thus, for
comparing , we have,

We get,

Thus, 
If
and
, then you can replace
in either equation with the equivalent expression given by the other equation. In this case, you have

and you can solve for
.

Then
.
For the second system, you can write


Then substitute this into the second equation and you get


so that

Answer:
(5x+1)(2x^2+1)
Step-by-step explanation:
Add and subtract the second term to the expression and factor by grouping.
Answer:
5 hours
Step-by-step explanation:
First subtract the food cost from the total bill.
351.20 - 200.60 = 150.6
Than divide 150.6 by 30.12
150.6 ÷ 30.12 = 5