Answer:
-9
Step-by-step explanation:
Step 1 : Put like terms together
x + 9 = 21 + 3x - 4 + 10
Subtract 3x on both sides
-2x + 9 = 21 - 4 + 10
Subtract 9 on both sides
-2x = 21 - 4 + 10 - 9
Simplify
-2x = 18
Step 2 : Divide
= 
x = -9
It was given that
1 gal = 20 lbs of CO2
1 gal = 25 miles distance
Thus,
15000 miles/year ( 1 gal / 25 miles ) ( 20 lbs CO2 / 1 gal ) = 12000 CO2
<span>If Harry drives 15,000 miles per year, his vehicle will add 12000 pounds of CO2 to the atmosphere.</span>
Answer:
-3, 9
Step-by-step explanation:
x^2 -6x - 27=
= x^2 - 9x + 3x - 27
= x(x - 9) + 3(x - 9)
= (x + 3)(x - 9)
x = -3, x = 9
Distributive Property: The property which states that multiplying a sum by a number gives the same result as multiplying each addend by the number and then adding the products: a(b+c)=ab+ac.