The sum of 6 times a number and -6 added to 9 times a number

Create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1.

Awater tank holds 18000 gallons. how long will it take for the water level to reach 6000 gallons if the water is used at anaverage rate of 450 gallons per day

Ireally need subtract and simplify.(-y^2 – 4y - 8) – (-4y^2 – 6y + 3)show your work, ! i will mark you brainliest but you have to show your work.