Why is 0 not an identity for subtraction? explain

3x-5y=7 9x+10y=1 Solve the following system by addition?

A control chart is used to monitor a process mean by collecting sample means from that process on a regularly scheduled basis.

Brett is joining a new gym. He can join Power Plus or Heavy Hulk. At Power Plus, it will cost $34.65 per month, plus a sign-up fee of $23.00. At Heavy Hulk, it will cost $34.90 per month, plus a sign-up fee of $38.00.

A lot is 50 m by 38 m. A house 20 m by 8 m is built on the lot. How much area is left over?

Amy is thinking of a number. this number decreased by 18.8 is 77.2. Find Amy's number

Kayla is 2 times as old as gabriella. 12 years ago, kayla was 6 times as old as gabriella how old is gabriella now i need step by step so i know how and get full credit

Dan must do homework for 1/2 of an hour and clean his room for 1/3 of an hour before he can play. What faction of an hour must Dan do homework and clean before he can play

Solve for x. 34+x=12 Enter your simplified answer in the box.

An expression is shown below: 3pf^2 - 21p^2f + 6pf - 42p^2 Part A: Rewrite the expression so the GCF is factored completely. Part B: Rewrite the expression completely factored. Show the steps of your work.

Identify the variable expression that is not a polynomial. A. Y+1 B. C. x^12 D. 23