Answer: 69%
Step-by-step explanation:
10 cm
Find the area. 

Now calculate the area when a side is lengthened by 3 cm.
10+3=13 cm

Now calculate the difference.

Divide it by the original number (100) and multiply by 100

This is the increase.
If you are trying to find the percentage he received: 58/100
Total correct divided by total questions.
You get .58 or
58% by moving the decimal to spaces to the right.
Answer:
A. 9
Step-by-step explanation:
A counterexample shows that one side is true while the other is false
x>7 and x>11
sub in the answers
9>7 and 9>11 -this is true for the first half but false for the second
5>7 and 5>11 -this is false for both
13>7 and 13>11 -this is true for both
15>7 and 15>11 -this is true for both
Answer A is correct as it proves the statement to be incorrect