Answer:
Yes, it is -6
Step-by-step explanation:
That is because the square root of 9 is 3 and the square root of 144 is 12, so after taking the square roots you have: 3*12 -42 = -6
24 pencils = 100%
30 pencils = ___%
30 - 24 = 6, so:
24 / 6 = 4 (it means that there are 4 sixes in 100%)
100% / 4 = 25%
Check: 25% * 24 = 25/100 * 24 = 1/4 * 24 = 6
30 - 6 = 24 (correct)
Answer: There was an increase by 25%
20 miles = 100%
11 miles = ___%
1 mile = 100% / 20 = 5%, so:
5 * 11 = 55 [percent]
100% - 55% = 45%
Check: 45% * 20 = 45/100 * 20 = 45/10 * 2 = 9/2 * 2 = 9
20 - 9 = 11 (correct)
Abswer: There was a decrease by 45%
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