B would be the answer. hope it helps !
Answer:
seconds
Step-by-step explanation:
When the ball hits the ground, its height will obviously be 0. Therefore, you can set up the equation the following way:

Plugging this into the quadratic equation, you get:

Since the time must be positive, it takes the ball
seconds to hit the ground, or around 3.828. Hope this helps!
Answer:
y=-3x+9
Step-by-step explanation:
Just subtract -3x on both sides
Answer:
b=17
Step-by-step explanation:
b=(45+6)/3
b=51/3
b=17
she bought 17 books since the original price of evereything was 51 dollars before the discount of 6 dollars.
Answer:
sqrt(21)
Step-by-step explanation:
x = sqrt(7*3) = sqrt(21)