Answer:
80.95
Step-by-step explanation:
Percentage increase =
*100
=> (38-21)* 100/21 = 80.9523%
The answer round it to the nearest 100th = 80.95%
Solving the equation
we get 
Step-by-step explanation:
We need to solve the equation
and find value of x
Solving:

So, solving the equation
we get 
Keywords: Solving Equations
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Answer: it’s 1680 meters, i did this question today.
Step-by-step explanation:
He practiced for 1 hour and 30 minutes