Pump 1 can empty a pool in 8 hours while pump 2 can empty the same pool in 9 hours. if the two pumps worked together, how long would it take them to empty the pool?

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 33 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30 ∘c on monday, but decreased at a constant rate in the next 33 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2

Bob the builder is making 480kg of cement mix. this is made by cement, sand and gravel in the ratio 1: 3: 4