What is the area of a circle with a diameter of 15 mm? Use 3.14 for pie. Round to the nearest tenth.

176.6 mm^2

Step-by-step explanation:

We need to find the radius

r = d/2

r = 15/2 = 7.5

We want the area of a circle

A = pi r^2

A = pi * (7.5)^2

   = 3.14 * 56.25

    =176.625

Rounding to the nearest tenth

176.6 mm^2

here you go!

Step-by-step explanation:

Since time is one year in I = prt then the options below can be used

If you've had Algebra you can use Systems of Equations to solve this problem

x + y = 30,000  for the parts of the Principal

.09x + .08y = 2420  For the rates and total Earnings

Or you can use a substitution knowing your Principal, Rates and Total Earnings

Remember to write the rates as decimals.

First you can put everything in terms of x as follows

x + y = 30,000

y = 30,000 - x

y can be rewritten as 30,000 - x

Using the rates to total earnings we have

.09x + .08(30,000 - x) = 2420

Then just solve for x.