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3 years ago

9

A pair of sneakers is priced at $150 and is on sale. Yolanda pays $105 for a pair of the sneakers. What percent is the markdown

on the sneakers?

1 answer:

Otrada [13]3 years ago

7 0

638383873737377373893993

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Calculate the density of a block of metal with a volume of 12.5 cm3 and mass of 126.0 g

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3 years ago

Which number rounds to 341 when rounded to the nearest whole number

nata0808 [166]

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4 years ago

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3 years ago

Shonda made a model of a solid ice cream cone with a spherical scoop of ice cream on top, made out of clay.

IrinaVladis [17]

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3 years ago

What is the sum of 20x^2-10x-30

ivann1987 [24]

Answer:

The sum of the roots is 0.5

Step-by-step explanation:

<u><em>The correct question is</em></u>

What is the sum of the roots of 20x^2-10x-30

we know that

In a quadratic equation of the form

$ax^{2} +bx+c=0$

The sum of the roots is equal to

$-\frac{b} {a}$

in this problem we have

$20x^{2} -10x-30=0$

so

$a=20\\b=-10\\c=-30$

substitute

$-\frac{(-10)} {20}=0.5$

<u><em>Verify</em></u>

Find the roots of the quadratic equation

The formula to solve a quadratic equation is equal to

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

$a=20\\b=-10\\c=-30$

substitute

$x=\frac{-(-10)\pm\sqrt{-10^{2}-4(20)(-30)}} {2(20)}$

$x=\frac{10\pm\sqrt{2,500}} {40}$

$x=\frac{10\pm50} {40}$

$x=\frac{10+50} {40}=1.5$

$x=\frac{10-50} {40}=-1$

The roots are x=-1 and x=1.5

The sum of the roots are

$-1+1.5=0.5$ ----> is ok

5 0

3 years ago