Astudent has gotten the following grades on his tests. what is the minimum grade he must get on the last test in order to have an average of 84?
76, 93, 89, 71
the minimum grade he must get on the last test in order to have an average of 84 is x
what is x?

(9x-5) - (x+12) what’s the answer and also explain how to do it i need it for a test tomorrow

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

Which is the solution to the inequality? 2 3/52 1/15 b< 3 2/15 b> 3 2/15