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3 years ago

Find the percent of increase from 8 feet to 10 feet. Round the percent to the nearest tenth if necessary.

Mathematics

1 answer:

Misha Larkins [42]3 years ago

5 0

Answer:

20%

Step-by-step explanation:

10-8=2

If 10 is equal to 100%

So, 2 is 20%

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Please helppp meeeeeeee

natka813 [3]

Answer:

i dont know if this is right but i think that would be the second one

Step-by-step explanation:

i dont know if this is right but i think that would be the second one

3 0

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

Can any one help me in this please any math genius

andriy [413]

It is 10 to 1 significant figures

3 0

2 years ago

Which of the following equations could be used to find the value of 3,550 ÷ 25?

fiasKO [112]

Answer:

A is correct answer

Step-by-step explanation:

$(3000 + 500 + 50) \div 25 \\$

$(3550) \div 25$

$= = > 3550 \div 25$

Thanks

Don't forget to tell the name of your country.

8 0

2 years ago

What’s the solution to

finlep [7]

Answer:

Step-by-step explanation:

subtract 9 from 7 and is negative 2 then the last value is C

4 0

2 years ago