Math7 Ep #18-26, Page 149-150

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• 1.

18. 48 notebooks to 14 notebooks(Don't forget to write increase or decrease) -- spelling matters!

Explanation
The given correct answer is "71 decrease, 71% decrease." This means that the number of notebooks has decreased by 71, which is also equivalent to a decrease of 71% from the original quantity of 48 notebooks.

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• 2.

19. \$240 to \$320(Don't forget to write increase or decrease) -- spelling matters!

Explanation
The given correct answer states that there was a 33 increase and a 33% increase. This means that the amount has increased by 33 units and also increased by 33% of the original value.

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• 3.

20. 624 feet to 702 feet(Don't forget to write increase or decrease) -- spelling matters!

Explanation
The given correct answer states that there was an increase of 13 feet and a 13% increase in height. This means that the height went from 624 feet to 702 feet, resulting in both a numerical increase of 13 feet and a relative increase of 13% in comparison to the original height.

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• 4.

21a. Find the percent of change from 2008 to 2012. Round to the nearest tenth of a percent. Is it an increase or decrease?

Explanation
The correct answer is 3.8% increase. This means that there was a 3.8% increase from 2008 to 2012. It indicates that the value or quantity being measured has gone up by 3.8%. The answer "3.8 increase" is not correct because it does not specify the unit of measurement or indicate whether it is an increase or decrease.

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• 5.

21b. Find the percent of change from 2006 to 2008. Round to the nearest tenth of a percent. Is it an increase or decrease?

Explanation
The percent of change from 2006 to 2008 is a 2.9% decrease. This means that the value decreased by 2.9% from 2006 to 2008. The "2.9 decrease" option is not correct because it does not specify the unit of measurement (percentage) and it does not indicate whether it is an increase or decrease.

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• 6.

22. Shoe sales for a certain company were \$25.9 billion. Sales are expected to increase about 20% in the next year. Find the projected amount of show sales next year.

Explanation
The projected amount of shoe sales next year is \$31 billion. This is found by taking the current sales of \$25.9 billion and increasing it by 20%.

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• 7.

23. Eva estimates that 475 songs will fit on her MP3 player. The actual amount of songs that it fits is 380. Find the percent error.

Explanation
The percent error can be found by taking the absolute difference between the estimated and actual values, dividing it by the actual value, and then multiplying by 100. In this case, the absolute difference is 475 - 380 = 95. Dividing 95 by 380 gives 0.25, and multiplying by 100 gives 25%. Therefore, the percent error is 25.25%.

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• 8.

24. The table shoes Catalina's babysitting hours. She charges \$6.50 per hour. Write a sentence that compares the percent of change in the amount of money from April to May and the percent of change from May to June. Round to the nearest percent if needed.

• A.

The amount from April to May is greater

• B.

The amount from May to June is greater

B. The amount from May to June is greater
Explanation
The correct answer is "The amount from May to June is greater" because it implies that the percentage increase in the amount of money from May to June is greater than the percentage increase from April to May.

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• 9.

25 (Part 1). Dario increased his savings from \$350 to \$413, while Monica increase her savings from \$225 to \$270. Fill in the statement:_____ had a higher percent of increase in savings. The difference in the percents of increase is _____.

• A.

Dario; 5%

• B.

Monica; 12%

• C.

Monica; 2%

• D.

Dario; 18%