Questions in mathematics

Questions in mathematics

[Done] 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?

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

[Done] Charles can do a job in 1 hour, Bill can do the same job in 2 hours, and Bob can do the job in 3 hours. How long does it take them to do the job working together?

[Done] How do you round \(5 \frac{1}{8}\) to the nearest whole number?

[Done] 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

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

[Done] If 500 students attend Washington Middle School, how many are going to the mountians for vacation? A. 25 B. 60 C. 75 D. 100 E. 125

[Done] On a map, \(\frac{1}{3}\) inch equals 15 miles. The distance between two towns on the map is \(3 \frac{2}{3}\) inches. How many miles are actually between the two towns? A. 11 B. 16 C. 88 D. 132 E. 165

[Done] What is the probability of drawing a black queen from a deck of cards, and then rolling a number greater than 4 on a number cube?

[Done] What is 15% of 60? Can someone please explain how to calculate this as well? Thank you!