3x-2y + z = 0
6x + 2x +3z=-2
3x- 4y+ 5z = 5
solve by row echelon form

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 3 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 3 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?

Three consecutive integers have a sum of 234. what are the three integers