A pupil wrote: For all numbers j and k (j+k)^2 = j^2 + k^2. Show that the pupil is wrong.

What kinds of numbers have an odd number of factors?

Find the solutions for a triangle with a =16, c =12, and b = 63º

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.