exam Maths Puzzle Numerical Ability

find the common monomial of -2x, 2xy, 4y, x, -xy, -y

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exam Other Question

Add thirty-eight and nine tenths, five and fifty-eight hundredths, seven, and fifteen and eight tenths.

OK I was wrong I have one more problem that I cannot grasp. Help please. From a base elevation of 6400 ft. a mountain peak in Colorado rises to a summit elevation of 14725 ft over a horizontal distance of 15841. Find the grade of the peak.

The grade of the peak is 52.55 %