Answer:
A. finished 1km
Step-by-step explanation:
b. 8km per hour
first one is C and second is D
What number do you need help with
The range for group 2 is greater than the range for group 1
The correct answer is Choice A.
This is an example of an exponential equation, so we need the formula

.
The a value is the starting value of 100. The b value must be a decimal lower than 1 because it is decreases.
If you substitute in 8 for x, you will see that the output is about 50 (half of 100).