book Maths Puzzle Numerical Ability

A circle with radius 10 and center (h,6) passes through the points (8,-2). Find the possible values of h.
a. 2 or 8
b. 2 or -6
c. -6 or 14
d. 2 or 14

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book Other Question

simplify

4x-7/2(6)+x[8(4)/2x]
Find the slope, if it exists, of the line containing the pair of points (4,-8) , and (-7,-8)