If you would like to know which is the correct unit of measurement to use when figuring out how many yards each child would run in the race, you can calculate this using the following steps:
80 yards * 2 + 60 yards * 2 = 160 + 120 = 280 yards
The correct measurement would be A. yards.
Setting y = 0, and solving for x, 0 = -.017x^2 + 0.55x, x= 0 and 32.35 feet
The vertex is its highest vertical height. Using the x coordinate of the vertex which is -b/2a, this is .55/(2*0.17 = 16.17 or 1/2 the horizontal distance, it maximum height is 4.45 feet = f(16.17)
Answer:

Step-by-step explanation:

Answer:
Average Rate of change = 2
Step-by-step explanation:
Given - A rabbit hops 8 meters in one second. After 7 seconds, the rabbit has hopped 20 meters.
To find - What is the rabbit's average rate of change?
Formula used -
Average rate of change of a function f(x) in an interval [a, b] is 
Proof -
Given that,
In 1 second - Rabbit hoops 8 meters
In 7 seconds - Rabbit hoops 20 meters
So,
Average Rate of change = 
= 
= 2
⇒Average Rate of change = 2
Option D is a linear equation, so it represents a direct linear variation.
Hope this helps!