Ms. Marine calculated that her hoop earring has a diameter of 3.5 centimeters. What is the area of her earring (round to the hundredths place)?

Area,

Step-by-step explanation:

We have,

Diameter of earring, d = 3.5 cm

It is required to find the area of her earring. The earring is in the shape of a circle. The area of a circle is given by :

r is radius of circle

or

So, area of her earring is .

To find the sales tax you’d need to find 9% of 87. You find this by using this template, x%/100%=y/z, x being the sales tax, y being 9% in cash, and z being the 87 dollars. You multiply the x value by the z value, (9 X 87=783) and then divide that product by 100%. This gives you the sales tax of 7.83, and when you add that to 87 you get $94.83. Subtract that from the 5 20 dollar bills ($100) and you are left with $5.27 change.