C(h) = −0.09h^2 + 3.5h + 8
sub in 3 for H
C(3) = -0.09(3)^2 + 3.5 (3) + 8
=17.69 ppm
Hope that helps! :)
Answer:
-5
Step-by-step explanation:

Multiply 2 · 2 = 4

Subtract 4 - 7 = 3

Add 3 + 17 = 20

Multiply 2 · 5 = 10

Add -14 + 10 = -4

Divide 20 ÷ 4 = -5

Answer:
8 feet
Step-by-step explanation:
You would use the Pythagorean theorem to find it.
a^2 + b^2 = c^2
Therefore:
6^2 + b^2 = 10^2
36 + b^2 = 100
-36 -36
b^2 = 64
Square root both sides
b = 8
Answer:
2n - 3
Step-by-step explanation:
twice a number means to multiply it by 2
difference of a number and 3 is a number being reduced by 3 so the 3 comes after the subtraction sign
Answer:
225 hours.
Step-by-step explanation:
45 x = 225