Sue wants to use mental math to find 7x53 write an expresión she could use

Name the most appropriate metric unit for each measurement

There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)