What expression is equivalent to 3x + 10 - x + 12

Me find the missing dimension of a triangle height: 7 in., area: 21^2

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x,y) ?

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.