Exercise 25 Page 149

To determine the percent change p, we can use the following general formula. p % =Amount of increase or decrease/Original amountFrom the given lengths, we can see that the new length is greater than the original length. To find the increase, we have to subtract the original amount from the new one. 5 12- 2= 3 12 Knowing how much the length increased, we can use the formula to calculate the percent increase.

Percent change=Amount of increase/Original amount

SubstituteValues

Substitute values

Percent change=3 12/2

WriteDec

Write as a decimal

Percent change=3.5/2

UseCalc

Use a calculator

Percent change=1.75

WritePercent

Convert to percent

Percent change = 175 %

The percent change is 175 %.