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3 years ago

PLS HELPPP WILL GIVE BRAINLIEST

Mathematics

1 answer:

FromTheMoon [43]3 years ago

7 0

Answer:

Step-by-step explanation:

all explanation you need in the page above

brainliest please

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Look at triangle ABC

Lubov Fominskaja [6]

Answer:

Option D is the correct option.

Step-by-step explanation:

Given,

A ( 4, 5 ) , B ( 2 , 2 ) , C ( 4 , 2 )

Let,

A ( 4 , 5 ) → ( x1 , y1 )

B ( 2 , 2 ) → ( x2 , y2 )

Now, finding the length of AB

Use the distance formula to find the length of AB

$= \sqrt{ {(x2 - x1)}^{2} + {(y2 - y1)}^{2} }$

plug the values

$= \sqrt{ {(2 - 4)}^{2} + {(2 - 5)}^{2} }$

Calculate the difference

$= \sqrt{ {( - 2)}^{2} + {( - 3)}^{2} }$

Evaluate the power

$= \sqrt{4 + 9}$

Add the numbers

$= \sqrt{13}$

Hope this helps..

Best regards!!

6 0

4 years ago

Discuss all possible scenarios for the Discriminant when solving a Quadratic equation using Quadratic formula? Give an example.

a_sh-v [17]

Explanation:

For a quadratic equation in standard form with real coefficients:

$ax^2+bx+c=0$

The quadratic formula giving its solutions is ...

$x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}$

The quantity under the radical is called the discriminant. If we let d represent it, then ...

d = b²-4ac

and there are three possibilities:

d < 0. The solutions involve the square root of a negative number, so both are complex. They are conjugates of each other.
d = 0. There is one real solution. It has multiplicity 2.
d > 0. There are two distinct real roots.

If the coefficients of the quadratic are rational, the roots will be irrational if and only if d is not a perfect square.

_____

The above formula still applies when coefficients are complex or irrational (or both). In the case of complex coefficients, the description of the number of roots is accurate, but their description as real or complex may not apply.

_____

Examples:

(x -1)² +1 = 0 = x² -2x +2 . . . . d = (-2)²-4(1)(2) = -4; roots are x = 1 ± i

(x-2)² = 0 = x² -4x +4 . . . . . . d = (-4)² -4(1)(4) = 0; roots are x = 2 (twice)

(x+3)² -4 = x² +6x +5 . . . . . . d = 6² -4(1)(5) = 16; roots are x = -5 and x = -1

3 0

4 years ago

What proprety shows that 2/5 x 1 =40/100

UkoKoshka [18]

Commutative Property.

It cannot be multiplication property because it would have to be live 5 x 1 = 5. For multiplication property the answer has to be the same as the number you used to get the answer. Does that make sense? I can send you a pic if you need it. I might be wrong because I just learned it now so I could give you an answer but from the example I got it has to be like 25x1=25, 100x1=100 something like that

7 0

4 years ago

Read 2 more answers

Find the minimum sample size necessary to be 99% confident that the population mean is within 3 units of the sample mean given t

SVEN [57.7K]

Answer:

The minimum sample size required is 207.

Step-by-step explanation:

The (1 - α) % confidence interval for population mean μ is:

$CI=\bar x\pm z_{\alpha /2}\frac{\sigma}{\sqrt{n}}$

The margin of error of this confidence interval is:

$MOE=z_{\alpha /2}\frac{\sigma}{\sqrt{n}}$

Given:

$MOE=3\\\sigma=29\\z_{\alpha /2}=z_{0.01/2}=z_{0.05}=2.576$

*Use a z-table for the critical value.

Compute the value of n as follows:

$MOE=z_{\alpha /2}\frac{\sigma}{\sqrt{n}}\\3=2.576\times \frac{29}{\sqrt{n}} \\n=[\frac{2.576\times29}{3} ]^{2}\\=206.69\\\approx207$

Thus, the minimum sample size required is 207.

3 0

3 years ago

Explain whether (x+3) is a factor of 2x^2-5x-3? Please help

kirza4 [7]

Is that the full question? I simplified it to 2x^2 -5x +18 when you plug x+3 in for the variable (x) in the expression. I’m honestly not sure when to go from there. Hope that helps with something. Sorry I couldn’t do more

8 0

4 years ago