Ireally need and no one will

solve each system by substitution. explain step by step

r + s = -12
4r - 6s = 12

My math teacher told my class to "steal" a 6th grade fraction word problem from the internet, word problems? : -p requirements: only a 1 step word problem. needs to be complex.

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

Does the point (1, sqrt 7) lie on circle shown.