Answer: 
Step-by-step explanation:
Move all terms to one side.

Use the Quadratic Formula.
, 
Answer:
Simplify -> 16^z + 2^1+6z - 2
Step-by-step explanation:
Answer: 12 minutes
Step-by-step explanation:
7 km ........ 4 minutes
21 km ...... ?
21/7 x 4= 12 minutes
Answer: the 2nd bubble B
Step-by-step explanation: