Perform the operation to simplify (-2x^4 + x^2 - x - 9) + (x^4 -x^3 -5x +3)

In the surface area formula for cylinders which expressionrepresents the lateral area

What is the sum of these mixed numbers 2 1/8 + 4 3/8

What can each term of the equation be multiplied by to eliminate the fractions before solving? x – + 2x = + x 2 6 10 12