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3 years ago

Answer that pls ty (ﾉ◕ヮ◕)ﾉ:･ﾟ✧ ありがとうと答えてください (ﾉ◕ヮ◕)ﾉ:･ﾟ✧

Mathematics

1 answer:

nikdorinn [45]3 years ago

4 0

Answer:

1= 23

2= 0.5

3= 1.45

4= 0.07

Step-by-step explanation:

(hope this helps can i plz have brainlist :D hehe)

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4 years ago

A square has a perimeter of 28 ft. What is the length of each side? and it is in ft

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3 years ago

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-\frac{9x}{4}=27

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$\bf \cfrac{-9x}{4}=27\implies \stackrel{\textit{cross multiplying}}{-9x=4(27)}\implies x=\cfrac{4(27)}{-9}\implies x=4\cdot \cfrac{27}{-9} \\\\\\ x=4\cdot -3\implies x=-12$

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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:

The correct question is

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

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

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

substitute

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

Verify

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

Answer that pls ty (ﾉ◕ヮ◕)ﾉ*:･ﾟ✧ ありがとうと答えてください (ﾉ◕ヮ◕)ﾉ*:･ﾟ✧

Answer that pls ty (ﾉ◕ヮ◕)ﾉ:･ﾟ✧ ありがとうと答えてください (ﾉ◕ヮ◕)ﾉ:･ﾟ✧