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3 years ago

The price of an item has been reduced by 20%. The origanal price was $90. What is the price of the item now?

Mathematics

2 answers:

Gala2k [10]3 years ago

7 0

Answer: $72

Step-by-step explanation:

90x.2=18

90-18=72

Hope this helped :)you turn your percent into a decimal and multiply it buy your original price and you get how much money you're saving which is 18 dollars then you subtract it by your original price

Rudiy273 years ago

4 0

Answer:

Step-by-step explanation:

when asked to decrease a number by a certain percentage, take the original number as 100%

here 90 is equivalent to 100%.

We subtract 20% from 100% to get 80% ( that's the new value)

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What are the exact solutions of x2 − 5x − 7 = 0, where x equals negative b plus or minus the square root of b squared minus 4 ti

Marat540 [252]

Answer:

$x = \frac{5 + \sqrt{53}}{2}$ or $x = \frac{5 - \sqrt{53}}{2}$

Step-by-step explanation:

Given

$x^2 - 5x - 7 = 0$

Required

Solve for x using:

$x = \frac{-b \± \sqrt{b^2 - 4ac}}{2a}$

First, we need to identify a, b and c

The general form of a quadratic equation is:

$ax^2 + bx + c = 0$

So, by comparison with $x^2 - 5x - 7 = 0$

$a = 1$ $b = -5$ $c = -7$

Substitute these values of a, b and c in

$x = \frac{-b \± \sqrt{b^2 - 4ac}}{2a}$

$x = \frac{-(-5) \± \sqrt{(-5)^2 - 4 * 1 * -7}}{2 * 1}$

$x = \frac{5 \± \sqrt{25 +28}}{2}$

$x = \frac{5 \± \sqrt{53}}{2}$

Split the expression to two

$x = \frac{5 + \sqrt{53}}{2}$ or $x = \frac{5 - \sqrt{53}}{2}$

To solve further in decimal form, we have

$x = \frac{5 + 7.28}{2}$ or $x = \frac{5 - 7.28}{2}$

$x = \frac{12.28}{2}$ or $x = \frac{-2.28}{2}$

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ankoles [38]

Answer:

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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2. sin(π) = 0

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kumpel [21]

Answer: 30%

Step-by-step explanation:

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