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3 years ago

13

A hardware store sells a 5-pound box of nails for $16.80. The store is having a 20 percent off sale on all merchandise. What is

the sale price of one 5-pound box of nails?

2 answers:

Makovka662 [10]3 years ago

6 0

Answer:

$13.44

Step-by-step explanation:

A percent is a portion of 100. If $16.80 is 100% of the price, and we receive 20% off then we pay 80% of the price. 100%-20%=80%. We find the new price by multiplying 16.80 by the percent as a decimal. 80% is 0.80.

16.80(0.80)=$13.44.

dexar [7]3 years ago

3 0

Answer: B

Step-by-step explanation:

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Step-by-step explanation:

Original quadratic equation is $9x^{2}-3x-2=0$

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$x^{2} - \frac{x}{3} - \frac{2}{9}=0$

Add $\frac{2}{9}$ to both sides to get rid of the constant on the LHS

$x^{2} - \frac{x}{3} - \frac{2}{9}+\frac{2}{9}=\frac{2}{9}$ ==> $x^{2} - \frac{x}{3}=\frac{2}{9}$

Add $\frac{1}{36}$ to both sides

$x^{2} - \frac{x}{3}+\frac{1}{36}=\frac{2}{9} +\frac{1}{36}$

This simplifies to

$x^{2} - \frac{x}{3}+\frac{1}{36}=\frac{1}{4}$

Noting that (a + b)² = a² + 2ab + b²

If we set a = x and b = $\frac{1}{6}\right)$ we can see that

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$\left(x - \frac{1}{6}\right)^2= \pm\frac{1}{4}$

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$\sqrt{\frac{1}{4}} = \frac{1}{2}$

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Answer:

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Step-by-step explanation:

Consider the provided information.

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