Question

question 4(multiple choice worth 2 points) (making predictions mc) a student mows lawns on the weekends. it takes him 140 minutes to mow 4 lawns. what prediction can you make about the time he will spend this weekend if he has 12 lawns to mow? it will take him 3 hours to mow 12 lawns. it will take him 7 hours to mow 12 lawns. it will take him 10 hours to mow 12 lawns. it will take him 12 hours to mow 12 lawns. question 5(multiple choice worth 2 points) (experimental probability mc) there are 10 brown, 10 black, 10 green, and 10 gold marbles in bag. a student pulled a marble, recorded the color, and placed the marble back in the bag. the table below lists the frequency of each color pulled during the 40 trials.

Explanation:

Step1: Find time per lawn

First, convert 140 minutes to hours. Since 1 hour = 60 minutes, 140 minutes = $\frac{140}{60}=\frac{7}{3}$ hours for 4 lawns. Then the time per lawn is $\frac{7/3}{4}=\frac{7}{12}$ hours per lawn.

Step2: Calculate time for 12 lawns

Multiply the time per lawn by the number of lawns. Time for 12 lawns is $\frac{7}{12}\times12 = 7$ hours.

Answer:

It will take him 7 hours to mow 12 lawns.