Mrs. dinson has 9 pencils on her desk. she has
3 pencils in a box. to find the number of pencils
she has altogether, mrs. dinson writes 9 + 3 = 12.
what other addition fact could mrs. dinson use?

Which expression is equivalent to (9x - 3 1/ + 1 3/8)

What is the standard form of -5x^2+2x^4-11+x^3+3x

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.