Answer:
12 minutes
Step-by-step explanation:
First we figure out how much of a car each person can wash in 1 minute.
Shea can wash the car by herself in 20 minutes
Therefore, she can wash a car in 1 minute = 
Tucker can wash a car in 30 minutes.
Tucker can wash the car in 1 minute = 
Thus, in one minute together they wash a car
+ = 
= 
In one minute together they can wash = of a car
Time needed to wash entire car together = 12 minutes.
It takes them 12 minutes to wash the car.
X=c/1/a+1/b
Because you have to multiply both sides by x then regroup them, then you divide both sides by 1/a+1/b
Answer:
A. 2 distinct roots.
Step-by-step explanation:
2x^2 + 8x + 3 = 0
Finding the discriminant:
b^2 - 4ac = 8^2 - 4 * 2 * 3
= 64 - 24
= 40
The discriminant is positive but not a perfect square
So there are 2 distinct ,real, irrational roots.
(x-10)(x-2)=0
x(x-2) -10(x-2)=0
x^2 -2x -10x -20 =0
x^2 -12x -20= 0
For a) the pattern rule goes 12+(12x2)=36 36+(12x4)=84
So the pattern rule is double the number and then times it by twelve to get to the next answer
