The formula for the circumference of a circle is c=2pir where r is the radius and c is the circumference. The equation r is r=c/2pi

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?

What is the factored form of the following expressions? d^2 – 13d + 36

The square root of 9x plus 7 plus the square rot of 2x equall to 7