Suppose a railroad rail is 5 kilometers and it expands on a hot day by 20 centimeters in length. approximately how many meters would the center of the rail rise above the ground?

Factor the monomial completely 42a3b3

What is the value of x in the equation 1/5x - 2/3y = 30 , when y = 15

Find the radius of a circle that has a circumference of 16. the formula for the circumference of a circle is c = 2tr, where r is the radius and c is the circumference. the equation solved for r is r = c over 2π. r=4 r= 8 r=12 r= 16