Which ratio correctly compares 120 cm to 80 mm?

a.
3 to 20

b.
3 to 2

c.
15 to 1

d.
150 to 1
(need answer asap)

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9

Which expressions are equivalent to k/2 choose 2 answers: a k-2 b 2/k c 1/2k d k/2 e k+k