The sum 9 of and x
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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)