Variation and Quadratic Motion

Mrs. Martone's 7th grade science class built and launched rockets. The graph below shows the height, in feet, over time, in seconds, of a student's rocket. Use the graph to answer the questions below. How long did it take the rocket to reach its maximum height?

• 1 second

• 5 seconds

• 7 seconds

• 11 seconds

Mrs. Martone's 7th grade science class built and launched rockets. The graph below shows the height, in feet, over time, in seconds, of a student's rocket. Use the graph to answer the questions below. How long was the rocket in the air?

• 1 second

• 7 seconds

• 14 seconds

In Projectile Motion Quadratic Word Problems, what does the y-value always represent?

• Time

• Height

• Distance

• Total

In Projectile Motion Quadratic Word Problems, what does the x-value always represent?

• Time

• Height

• Distance

• Total

Which equation matches the graph?

• 
• 
• 
• 

• 100 feet

• 64 feet

• 140 feet

• 88 feet

• t = 3 seconds

• t = 10 second

• t = 4 seconds

• t = 2 seconds

Which of the following represents direct variation?

• y = kx
• y = k/x
• y = x/k
• y = mx + b

Assume y varies inversely with x. If x=7 when y=4, what is y when x=2 ?

• 4
• 14 
• 7
• 28

The number of hours to paint a house varies inversely with the number of painters working. A 2400-square foot house can be painted in 27 hours by 6 painters. How many painters would need to work in order to paint the house in 18 hours?

• 8 painters
• 10 painters
• 9 painters
• 11 painters