exam Maths Puzzle Numerical Ability

Find the surface area of a right solid of 8 inch high with the bse of 10in x 4 in x 10in.

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exam Other Question

Find the slope of the line passing through the points (-9, -4) and (0, -4).

A) Undefined B) 0 C) 1 D) 9
What is the explicit formula for the sequence?

3, 6, 12, 24, ...
a. an = 3*2^(n-1)
b. an = 2*3^(n-1)
c. an = 3*-2^(n-1)
d. an = 3^(n-1)