exam Maths Puzzle Numerical Ability

A course consits of four 100 point exams. A student scores 60 points on the first exam. What average must be obtained on the next three exams to obtain an overall average of 75%?

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exam Other Question

Find the polynomial f(x) of degree three that has zeroes at 1,2, and 4 such that f(0)= -16. ? help
Write in slope-intercept form the equation of the line passing through (1,3) and (-5,-1). Show that this line is perpendicular to the line y=-3/2x+17. thanks