book Maths Puzzle Numerical Ability

Perform the indicated operation

(-3x^4 + 4x^2 - 7x + 10) - (-2x^3 + 6x^2 - 5x + 3)

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book Other Question

When graphing a linear inequality, how do you know if the inequality represents the area above the line? Two-fifths of a certain no. decreased by three-fourths is equal to seven-eights. What is the no.?