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3 years ago

10

HELP! Ill vote brainliest and 60 pts is on the line!

2 answers:

WITCHER [35]3 years ago

4 0

Answer:

2

Step-by-step explanation:

$2x^2-8x+7=0\\\\$

a=2

b=-8

c=7

$\frac{8+ \sqrt{16-4(2)(7)} }{4}$

4± $\sqrt{2}$ /2

Burka [1]3 years ago

3 0

Answer:

The answer is 2 hope this helps :3

Step-by-step explanation:

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A train decreased its speed by 72 miles hour in 12 minutes. Find the average change in speed per minute.

melisa1 [442]

Answer:

6 mph

Step-by-step explanation:

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2 years ago

Write 2, 330, 000 in scientific notation?

Genrish500 [490]

Answer:

2.33 × 10^6

Step-by-step explanation:

I just used a calculator, to be honest. It was super simple.

2.33 * 10^6

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3 years ago

Which shows an equation for this situation?

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3 years ago

We have x = 7 so now solve for y by replacing x with 7 in this equation 2x + y = 20

Ivahew [28]

Answer:

y=6

Step-by-step explanation:

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7 0

3 years ago

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The volume of a cone is 3πx3 cubic units and its height is x units. Which expression represents the radius of the cone’s base, i

dalvyx [7]

Answer:

<em>r=3x</em>

Step-by-step explanation:

<u>The Volume of a Cone</u>

The volume of a cone of radius r and height h is:

$\displaystyle V=\frac{1}{3}\pi hr^2$

We are given the volume of a cone is

$V=3\pi x^3$

Equating:

$\displaystyle \frac{1}{3}\pi hr^2=3\pi x^3$

Multiplying by 3:

$\pi hr^2=9\pi x^3$

Simplifying by pi:

$hr^2=9 x^3$

Since h=x:

$xr^2=9 x^3$

Dividing by x:

$r^2=9 x^2$

Taking square roots:

$r=\sqrt{9 x^2}=3x$

Thus: r=3x

5 0

3 years ago

Read 2 more answers