Only thing I can tell you is to use a corner to a piece of paper. The corner is 90 degrees. It's acute if the corner is bigger than the angle. Obtuse if its smaller.
Answer:
2.) 
3.)
4.)
5.)
Step-by-step explanation:
(surface area of a rectangular prism)
3.) 
4.) 
5.) 
The nearest tenth is
129.6
Yes this equation is a linear equation in two variables. Because for every value of “x” there is an alternate value for “y”
For this case, the first thing we must do is define variables.
We have then:
d: number of dimes
q: number of quarters
We now write the system of equations that models the problem.
We have then:
He has a total of 30 coins:

The toal value of Kyles coins is $ 4.80:

Answer:
A system of equations that can be used to find the number of dimes, d, and the number of quarters, q, kyes has is:

