The volume of a cylinder is 63 pi cm^3 . If the radius is 3cm, what is the height of the cylinder? A. 3.5 cm
B. 21 cm
C. 10.5 cm
D. 7 cm

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Which of the following expressions are equivalent ?

Thales was an ancient philosopher familiar with similar triangles. one story about him says that he found the height of a pyramid by measuring its shadow and his own shadow at the same time. if the person is 5-ft tall, what is the height of the pyramid in the drawing?

Aquadratic equation in standard from is written ax^2= bx+c, where a, b and c are real numbers and a is not zero?