Question

1. marcus owes his mother $10. he babysits his little sister and earns $25. then he cleans the garage and earns $32. after he pays his mother, how much money does marcus have?
2. the water in a lake is 4 feet above its usual level. then the level of the lake drops 7 feet. if 0 represents its usual level, which number line shows the final level of the water in the lake?

circle the word that best completes the sentence.

1. donna subtracts a positive number from a greater positive number. the resulting difference will be positive / negative.
2. devon subtracts a positive number from a lesser positive number. the resulting difference will be positive / negative.

spiral review

1. elena draws a scale drawing for a garden. the scale drawing is 3 inches by 6 inches. the garden will be 12 feet by 24 feet. what is the scale of the drawing in inches to feet?
2. raoul makes shell necklaces to sell at a craft fair. the supplies for each necklace cost $3.75. raoul sells the necklaces for $11.25. what is the percent markup for a shell necklace?
3. neveah goes out to dinner at a restaurant. the bill for dinner is $57.25, and neveah gives the server a 20% tip. what is the total cost for dinner?

Explanation:

Step1: Calculate total earnings

Marcus earns \(25 + 32=\$57\) from babysitting and cleaning the garage.

Step2: Calculate money after paying debt

He owed his mother \(\$10\). So, \(57- 10=\$47\)

Step1: Initial water level

The water is \(4\) feet above usual level (\(+4\)).

Step2: Calculate final level

It drops \(7\) feet. So, \(4-7=-3\). The number line with the point at \(-3\) is correct.

When subtracting a positive number from a greater positive number (\(a - b\), \(a>b>0\)), \(a - b>0\).

When subtracting a positive number from a lesser positive number (\(a - b\), \(0 < a < b\)), \(a - b<0\).

Answer:

\(47\)