David hikes 2 1⁄4 miles in 1/2 an hour. At this rate, how long will it take him to walk 18 miles?

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

Billie holiday sells children's clothing for sara vaughn's toddler shop. baby blankets sell for $29.99 after a markup rate based on cost of 109%. find the cost and the markup.

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b