What is the sum of -1.4-(-0.5)=-1.4+0.5
Help me Please

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.

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

2x minus y equals 6, x plus y equals negative 3