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Questions in Grade Middle-school

[Homework Help] On Tuesday, Donovan earned $9 for 2 hours of babysitting. On Saturday, he babysat for the same family and earned $31.50. How many hours did he babysit on Saturday?

[Homework Help] Tim can mow 4 lawns in 6 hours. How many lawns can he mow in 15 hours?

[Homework Help] The Pet Palace is replacing its dog training arena with a new arena with dimensions that are twice as large. Old arena: height = 10 ft, base = 15 ft New arena: height = 20 ft, base = 30 ft How much greater is the area of the new arena compared to the old one? Answers given: A. 450 ft² B. 280 ft² C. 225 ft² D. 300 ft²

[Homework Help] What is the answer to the system of equations using elimination? \[ x + y = 4 \] \[ y = x + 4 \]

[Homework Help] Wolfgang's father is 26 years older than Wolfgang. In 10 years, the sum of their ages will be 80. What are their present ages? Please show the work.

[Homework Help] The new pencil was 19 centimeters long. How many millimeters long was the pencil?

[Homework Help] Why don't the present shapes of the continents fit perfectly into the supercontinent?

[Homework Help] Sketch the graph of each line. \[ y = x - 3 \]

[Homework Help] Maureen bought 3 pairs of shoes that cost $37.98 each. If the tax rate is 8%, how much did Maureen pay?

[Homework Help] Mr. Ordonez gives his math students 34 quizzes during 17 weeks of school. If he gave the same number of quizzes each week, how many quizzes does Mr. Ordonez give his students every week?