Two hours.
40%8=5 trees per hour. 50-40=10. 10% by 5=2.
Answer:

≤ x
Explanation:
-12 ≥ 24x
-12 = 24x
÷ -12 ÷ - 12 (flip the sign here)
1 = -2x
÷ -2 ÷ -2

= x

≤ x
C(3) = -0.09(3)² + 3.5(3) + 8
= -0.09 * 9 + 10.5 + 8
= -0.81 + 18.5
= 17.69 parts per million
Answer:
1 hour : 15 dollars
2 hours: 20 dollars
3 hours: 25 dollars
4 hours: 30 dollars
5 hours: 35 dollars
Step-by-step explanation:
Substitute the hour number in for h and solve. for example, if you were trying to find 5 hours, you would produce the equation c = 5(5) + 10. once you solve that you get c = 25 + 10 which is also c = 35.