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3 years ago

Find the surface area

Mathematics

1 answer:

makvit [3.9K]3 years ago

4 0

Answer:

I think it is 30 but i'm not really sure

Step-by-step explanation:

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6/9 in two different forms

maw [93]

Word form: Six over nine or two over three

Simpliest form: 2/3

3 0

3 years ago

Find+the+positive+value+for+α+if+the+radius+of+the+circle+3x^2+3y-6αx+12y-3α=0+is+4

Alik [6]

Answer:

$\alpha=3$

Step-by-step explanation:

Equation of a Circle

A circle of radius r and centered on the point (h,k) can be expressed by the equation

$(x-h)^2+(y-k)^2=r^2$

We are given the equation of a circle as

$3x^2+3y^2-6\alpha x+12y-3\alpha=0$

Note we have corrected it by adding the square to the y. Simplify by 3

$x^2+y^2-2\alpha x+4y-\alpha=0$

Complete squares and rearrange:

$x^2-2\alpha x+y^2+4y=\alpha$

$x^2-2\alpha x+\alpha^2+y^2+4y+4=\alpha+\alpha^2+4$

$(x-\alpha)^2+(y+2)^2=r^2$

We can see that, if r=4, then

$\alpha+\alpha^2+4=16$

Or, equivalently

$\alpha^2+\alpha-12=0$

There are two solutions for $\alpha$ :

$\alpha=-4,\ \alpha=3$

Keeping the positive solution, as required:

$\boxed{\alpha=3}$

8 0

3 years ago

Correct answer gets brainliest

Karo-lina-s [1.5K]

Answer:

B. 9 < 7 or x > 16.

Step-by-step explanation:

I had the same question and the answer was B.

7 0

3 years ago

Unit rate for 3 inches of rain in 6 hours

Travka [436]

3 (inches) / 6 (hrs) = 1/2 (or 0.5) inches per hr <==

6 0

3 years ago

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What is the reflection of the point (1.7, -4.9) across the x axis

Vitek1552 [10]

(-1.7, -4.9)

to reflect across the x-axis multiply the x-value by negative 1

8 0

3 years ago

Read 2 more answers