Sabrina is 4, her brother Sam is 9 years older than she is. How many years will Sam be twice as old as Sabrina?

If the dimensions of a rectangular prism are 5 ft x 3.5 ft x 2 ſt, what is the surface area?

Ascientist has discovered an organism that produces five offspring exactly one hour after its own birth, and then goes on to live for one week without producing any additional offspring. each replicated organism also replicates at the same rate. at hour one, there is one organism. at hour two, there are five more organisms. how many total organisms are there at hour seven? 2,801 19,531 19,607 97.655

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length