This pattern follows the "add 3" rule. What is the next number in the pattern?

3, 6, 9, 12, 15,

A. 17
B. 18
C. 19
D. 20

In the 30-60-90 triangle below side s has a length of and side r has a length

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?

Johnny rode his bike to a friends house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was unable to play. what was his displacement for the total bike ride trip? what could you use as a reference point ? show the steps to solve this problem.