A train travels from Tutuban to Calamba station. The distance between Tutuban and Calamba is defined by the function d(x) = x4 + x3 + 3x2 + 4x - x kilometers. If the train travels from Tutuban to Calamba for t(x) = x hours without stopping at any station, how fast is the train traveling?

Use the elimination method to solve the system of equations -x+5y=-4 and 4x+3y=16

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.

Find the solution of this system of equation -7x+y=-20 9x-3y=36