WILL GIVE BRAINLIEST!! One student has 3 a's, 3 b's and makes $60. Another student has 1 and 5 b's and makes $40. A's are worth $15. Write two equation to represent the situation.

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Pls! does anybody know a shortcut for answering these types of questions in the future?

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.