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3 years ago

So solve the following - 8 by 50 divided by 4 by 5

Mathematics

2 answers:

Vesna [10]3 years ago

5 0

Answer:

Step-by-step explanation:

8*50=400 /4*5=20

400/20=20

Tomtit [17]3 years ago

3 0

Answer: -20

Step-by-step explanation:

-8 by 50 ÷ 4 by 5

-8 × 50 ÷ 4 × 5

$\dfrac{-8\times 50}{4\times 5}\\\\\\=\dfrac{-2\times 10}{1\times 1}\\\\\\=\large\boxed{-20}$

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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

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3 years ago

Which ratio is equivalent to 3/20

ollegr [7]

A ratio equivalent to 3/20 can be 6/40 or even 9/60

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Answer: I think its n-12

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lora16 [44]

Answer:

Step-by-step explanation:

4 : 9

36 : ?

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