Describe the error in finding the number of people who live in a circular region with a 7.5-mile diameter and a population density of 1550 people per square mile. Question 2

The formula for the circumference of a circle was used instead of the formula for the area of a circle.

The diameter was substituted into the formula for the area of a circle instead of the radius.

The expression π⋅7.52 should be in the numerator of the fraction, not the denominator.

The expression π⋅7.52 simplifies to 56.25π2, not 56.25π.

Question 3
Correct the error. Round your answer to the nearest whole number.

The number of people who live in the region is about
.

Answer

Find out the determine if Kito has been billed correctly for his purchase.

To prove

As given

Kito makes on online purchase of a guitar case for $39.99, a tuner for $24.99 and picks for $26.99.

cost of all online purchase items = guitar case cost + tuner cost + picks cost

                                                      = $39.99 + $24.99 + $26.99

                                                      = $91.97

Taxes are 6% of the total purchase price.

6% is written in the decimal form.

= 0.06

Tax price = 0.06 × 91.97

                = $ 5.52 (Approx)

Total online purchase cost =  cost of all online purchase items + Tax price

                                            = $91.97 + $5.52

                                            =$ 97.49

As the shipping charges $8.20 from $50 up to $100 .

Total amount of kito billed = $ 97.49 + $8.20

                                            = $ 105.69

Therefore the option (a) is correct .

i.e Kito has been billed correctly.