Select the three expressions that are equivalent to 8n - 16m 4(2n - 4m)
4(2n + 4m)
2(4n - 8m)
2(4n + 8m)
16(n - m)
8(n + 2m)
16(n - 1/2 m)

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