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3 years ago

4/7+5/14+8/21 simplify

Mathematics

1 answer:

Dmitry_Shevchenko [17]3 years ago

8 0

Answer:

1 13/42

Step-by-step explanation:

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How do i convert -1 and 2/3 into a decimal?

hodyreva [135]

Step-by-step explanation:

-1 is already a decimal.

For any fraction you can use: 2/3=x/100

After that, you get x=approx 0.66...

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2 years ago

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If the volume of a container is 4*4*4 and you take off 8 what is the volume of the container

IRINA_888 [86]

✧･ﾟ: *✧･ﾟ:* *:･ﾟ✧*:･ﾟ✧

Hello!

✧･ﾟ: *✧･ﾟ:* *:･ﾟ✧*:･ﾟ✧

❖ The volume of the container is 52 units.

4*4*4 = 64

64 - 8 = 52

~ ʜᴏᴘᴇ ᴛʜɪꜱ ʜᴇʟᴘꜱ! :) ♡

~ ᴄʟᴏᴜᴛᴀɴꜱᴡᴇʀꜱ

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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

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3 years ago

A target with a diameter of 14cm has 4 scoring zones by concentric circles. The diameter of the center circle is 2 cm. The width

Leni [432]

Answer:

$48.98\%$

Step-by-step explanation:

we know that

The probability that it will hit a point in the outer (yellow) ring is equal to divide the area of the yellow ring by the total area of the target

step 1

Find the area of the yellow ring

$A=\pi [7^{2} -5^{2}]$

$A=24\pi\ cm^{2}$

step 2

Find the total area of the target

$A=\pi [7^{2}]$

$A=49\pi\ cm^{2}$

step 3

Find the probability

$24\pi/49\pi=0.4898$

Convert to percentage

$0.4898*100=48.98\%$

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3 years ago

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Which equation is not equivalent to the formula r = st?

maksim [4K]

We are given the formula r = st. We evaluate each option to know the correct answer.

A.) S = r/t
r = st

B.) t = r/s
r = st

C.) s = t/r
r = t/s

D.) r = ts
r = st

Therefore, the correct answer among the choice given is option C. It is not equivalent to the formula.

5 0

3 years ago

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4/7+5/14+8/21 simplify​

4/7+5/14+8/21 simplify