Find the pattern below and write the missing number:

3, 6, 9, 12, 15,___
, 21, 24.

Which ordered pair (c, d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?

Select the sequences that are geometric.