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3 years ago

Help, please I forget what to do :(

Mathematics

2 answers:

Annette [7]3 years ago

7 0

Answer:

The answer is 9.

I used a calculator, I recommend Algebra Calculator MathPapa

finlep [7]3 years ago

4 0

Answer:

Step-by-step explanation:

hope this helps (and maybe i can even get brainly lol)

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8.3E+2 using scientific notation

Tatiana [17]

Answer:

8.3*10^2

Step-by-step explanation:

The e just equals 10.

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2 years ago

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Kevin is making a banner with area of 7 square ft width and length of banner is whole numbers what numbers are possible dimensio

stepladder [879]

Answer:

Length = 7, width = 1.

Step-by-step explanation:

7 and 1 are the only possible dimensions as 7 is a prime number.

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3 years ago

if twenty percent of the students play in the band and the band has forty members, how many students are there?

olchik [2.2K]

The total amount of students are 200

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3 years ago

Please help i have no idea how to answer this

BabaBlast [244]

Answer: 1/32
Multiple 1/4 x 1/8 to get your answer

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2 years ago

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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:

<u>Equation of a Circle</u>

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