exam Maths Puzzle Numerical Ability

Consider the function f(x) = x^2 + 4x +1

Find h, the x-coordinate of the vertex of this parabola.

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exam Other Question

You scored 88.7, 91.2, and 94.6 on your last three test scores. Find the standard deviation of your test scores.
A. 0.95
B.1.22
C.2.42
D.4.35
solve the system of inequalities by graphing. if the system does not have a solution, write no solution.

2y+x<4
3x-y>1