Answer:
12.496
Step-by-step explanation:

the answer is 20
1/10 of 200 is 200* 1/10 = 200/10 which is 20
It will cost $90 and you will need 100 boards
Answer:
44.1
Step-by-step explanation:
Cosine = Adjacent over Hypotenuse
Adjacent of ∠T = 28 and hypotenuse = 39
Which means that 
Now we solve for x
To get rid of the "cos" we take the inverse of cos ( which is
) and apply it to each side

We're left with x = 44.11461855
Our last step is to round to the nearest tenth and we get that the answer is 44.1
F(x) = 2x +1.
Where x is the xth hour.
Therefore the 6th hour, x=6.
f(6) = 2*(6) +1
= 12 +1
=13. 13 Customers.
Cheers.