Riley is 3 years older than his sister. which of the following expressions shows the sum of their ages if s represents riley's sister's age?

a.3s
b. s + 3
c.2(s + 3)
d.2s + 3

Walking at a constant rate of 8 kilometers per hour, juan can cross a bridge in 6 minutes. what is the length of the bridge in meters?

What is the best estimate of the length of a football

Plzz ! if you were constructing a triangular frame, and you had wood in the length of 4 inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood? yes or no? = explain your mathematical thinking/show your work: