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ryzh [129]
3 years ago
7

Fred buys a video game disk for $8 after a 20% discount. what is the original price?

Mathematics
1 answer:
olga_2 [115]3 years ago
4 0
I believe this is the answer, im so sorry if im wrong

8 dollars is discount
100-20=80 so
8 dollars =80%
1 dollar=20%
80+20=100
8 + 1 = 9

original price=$9

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3)

Step-by-step explanation:

An equation is linear if equal changes in x produce equal changes in y.

Let's look at each choice.

1)

A decrease of 10% per year. That means each year, the value of the car is 0.9 times the value of the previous year.

For example, if the original value was $10,000, after 1 year, it is worth 0.9 * $10,000 = $9,000. In 1 year it lost $1,000. In the next year, its value is now 0.9 * $9,000. The value at the end of the 2nd year is $8,100. In the second year, it lost $900 in value. In one period of 1 year it lost $1000 in value. In another equal period of 1 year, it lost $900 in value. A change of 1 year in time produces different changes in loss of value, so it is not linear.

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Step-by-step explanation:

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2. We assume, that x is the value we are looking for.

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4. We know, that x% equals 20 of the output value, so we can write it down as x%=20.

5. Now we have two simple equations:

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6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

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