Please see all questions 6.7.13 They could mow the lawn nhours if they worked to

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6.7.13 They could mow the lawn nhours if they worked together (Simplify your answer.) 6.7.25 Suppose tat ding a testdr voftwo cars, one cartravels 252 minnthe uam e smetat he wend car travels 160 mies the speed of one car56 mle. per hour taster fanthe speed ofthe second cartrd the speed of both cars The speed of the Sest car i mh and the speed of he second car ih 6.7.41 For this pair of similar triangles, find the length of the indicated side The length is x A sample of 13 frecrackers contained&duds; How many duds would you expect in a sample of 2363 frecrackers How many duds would you expect in a sample of 233 frecrackers The ratio of the weight of an object on Mars to the weight of an object on Earth is 0.4 to 1 )A 13to rocke will weighton on Mars (Round to the nearest teth) a) How much will a 13 ton rocket weigh on Mars b) How much will a 164 atronautweigh on Mars? 7.79 A paddleboat can move at a speed of 14 km/h in still water. The boat is paddled 4 km downstream in a river in the same time it takes to go 2 km upstream What is the speed of the river? The speed of the river is km Type an ineger a fraction or a mixed number)

Explanation / Answer

Jack's one hour work = W/7

Marilyn's one hour work = W/5

Together their one hour work = W/7 + W/5 = 12W/35

Time taken together = W/(12W/35) = 35/12 = 2.916 hours

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