Mathematics, 17.10.2020 14:01 khloenm309
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A tank holds 2500 litres of oil.
A small pump can add oil to the tank at a rate of x litres per minute.
A large pump can add oil to the tank at a rate of (x + 20) litres per minute.
(i) Write down an expression, in terms of x, for the number of minutes the small pump takes to fill the empty tank.
(ii) Write down an expression, in terms of x, for the number of minutes the large
pump takes to fill the empty tank.
(iii) It takes 15 minutes longer to fill the empty tank using the small pump than it does with the large pump.
Form an equation in x and show that it simplifies to
(iv) Find the length of time the large pump takes to fill the empty tank. Give your answer in minutes and seconds, correct to the nearest second
Answers: 2
Mathematics, 21.06.2019 17:20, kolbehoneyman
Four airplanes carrying a total of 400 passengersarrive at the detroit airport. the airplanes carry, respectively,50, 80, 110, and 160 passengers. a) one of the 400 passengers is selected uniformly at random. let x denote the number of passengers that were on theairplane carrying the randomly selected passenger. find var(x)for x as given in the problemb) one of the 4 airplane drivers is also selected uniformly atrandom. let y denote the number of passengers on the chosen driver’s airplane. find var(y) for y as given in the problem
Answers: 3
Mathematics, 21.06.2019 18:00, joshuahagerman1404
In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.
Answers: 3
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A tank holds 2500 lit...
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