Answer:
The answer is x^3+3x^2-4
Have a great day!
-Seth
18 shells because since Mary has 6 and Tina has 3 shells all you have to do is multiply 6 and 3 to get 18
13. x = 4
14. x = -16
15. x = 11
Step-by-step explanation:
B. 90 degrees counterclockwise
