What is the ratio for the surface areas of the cones shown below, given that
they are similar and that the ratio of their radii and altitudes is 4:3?
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A. 16:9
B. 9:16
C. 64:27
D. 27:64

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles.

Ateacher wanted to buy a chair, a bookshelf, two tables and a desk. she spent $900 for all five items and the chair and the desk combined 70% of her total. if the bookshelf cost $50, how much did each of the tables cost?

Given that s is the centroid of triangle mno, find sq.