Answer:
Tax = 3$
Tot Cost = 33$
Step-by-step explanation:
10% of 30$ is 3$
(0.10 * 30 = 3)
the tax is 3$
30$ + 3$ = 33$
the total cost is 33$
The area of the square as a function of the radius is given by 2r^2
Check the attachment for solution