Answer:
1/2
Step-by-step explanation:
The radius is 1/2 of the diameter
These cannot be solved.- 3 unknowns require 3 equations
First let's make both the miles and the hours ran improper fractions:

So, to find our miles per hour, we have to divide the miles by the hours to get: 
Answer:
the one in bottom right
Step-by-step explanation:
If Jimmy's new cell cost him $49.99 with a 75% discount, then $49.99 is <span>100%−75%=25%</span><span> of the original price.
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The original price of the cell phone was <span>$199.96</span><span>.</span>