A new sports car costs $21,000 at the dealership. If the dealership is

Mathematics

1 answer:

Molodets [167]2 years ago

5 0

Answer:

16,800 dollars

Step-by-step explanation:

1. find 20 percent of 21,000= 4,200

2. subtract 4,200 from 21,000

21,000

-4,200

16,800 dollars

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12 points<br> Add 1.5 x 10^7 to 2.7 x 10^9.

Alina [70]

Answer

259000000

Step-by-step explanation:

6 0

2 years ago

A car wheel has a radius of 16 inches. Through what angle ( to the nearest tenth of a degree ) does the wheel turn when the car

olya-2409 [2.1K]

First of all, let's convert all the measures to the same unit: 4 feet are 48 inches.

Now, as the wheel turns, there is a proportion between the angle and the distance travelled: for example, when the car moves forward a whole circumference, the angle will be 360°. Conversely, if the wheel turns 180°, then the car will move forward a distance which is half the circumference of the wheel, and so on.

Since the radius is 16 inches, the circumference will be

$C=2\pi r = 32\pi$

So, we have the following proportion:

$360\div 32\pi = x \div 48$

that you can read as: "if an angle of 360 corresponds to a distance travelled of $32\pi$ , then the unknown angle x corresponds to a distance travelled of 48 inches.