The diameter of a penny is about 7.9 x 10^-5 km. It would take about 2.1 x 10^9pennies

placed end to end to circle the equator once. What is the approximate length of the

equator?

165,900 km

Step-by-step explanation:

diameter is a straight line between two points on the circumference of a circle that passes between the center of the circle.

so if a penny has a diameter of 7.9 x 10^-5 km, and when placed end to end will require 2.1 x 10^9 pennies to circle the equator once, that means;

the approximate length of the equator will be:

7.9 x 10^-5 km x 2.1 x 10^9 pennies

= 165,900 km

assuming you mean addition: addition and subtraction are reverse operations.

step-by-step explanation:

the final amount you will pay is $68.04.

the tip is determined by the pre-tax amount, so we calculate the tip based on the original bill, not after we've added sales tax.

to find the tip:

we can divide 54.00 by 100 to get 1% of 54. then we multiply that by 18.

54 / 100 = .54

.54 x 18 = 9.72

tip = 9.72$

to find the tax:

we can divide 54.00 by 100 to get 1% of 54. then we can multiply that by 8 to get 8%.

54 / 100 = .54

.54 x 8 = 4.32

tax= 4.32

now we can add the tip and tax to the bill to get our total.

54 + 9.72 + 4.32 = 68.04

total: $68.04

step-by-step explanation: