There will be 110 mushrooms I think.
Year one: 10
Year two: 10 plus 10
Year three: 20 plus 20
Year four: 40 plus 30
Year five: 70 plus 40 which equals 110 mushrooms.
The correct formula is the x + -1 and the reflection of the sun
Answer: -62.5 %
Step-by-step explanation:
We need to solve the following system by substituition:

To solve by substituition means that we need to isolate one variable in one of the equations and replace one expression with the other. This is done below:

Then we need to replace the value of "x" in any of the two equations.

The solution is (-3,-5).