Answer:
The ladder reaches 
Step-by-step explanation:
In the first case we have

In second case let the height be 
We have

We know that

Substituting

The ladder reaches 
X + 4 = x + 10
2x + 4 = 10
2x = 6
x = 3
Answer:
50 pounds of beans costs $40
Well, your equation is linear and not quadratic. Is the -8x supposed to be squared?