3 years ago

(3 pts) a fair coin is tossed 11 times. what is the probability that:

Mathematics

1 answer:

beks73 [17]3 years ago

3 0

<span>at least two heads appear? 509/512
c.at most 8 hea</span>

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Determine the next step for solving the quadratic equation by completing the square.

Studentka2010 [4]

Answer:

The solutions are $x=\frac{1+\sqrt{7}}{2}$ and $x=\frac{1-\sqrt{7}}{2}$

Step-by-step explanation:

we have

$0=-2x^{2}+2x+3$

Group terms that contain the same variable, and move the constant to the opposite side of the equation

$-3=-2x^{2}+2x$

Factor the leading coefficient

$-3=-2(x^{2}-x)$

Complete the square. Remember to balance the equation by adding the same constants to each side.

$-3-0.5=-2(x^{2}-x+0.5^{2})$

$-3.5=-2(x^{2}-x+0.5^{2})$

Rewrite as perfect squares

$-3.5=-2(x-0.5)^{2}$

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$x-0.5=(+/-)\sqrt{\frac{7}{4}}$

$x-\frac{1}{2}=(+/-)\frac{\sqrt{7}}{2}$

$x=\frac{1}{2}(+/-)\frac{\sqrt{7}}{2}$

$x=\frac{1+\sqrt{7}}{2}$

$x=\frac{1-\sqrt{7}}{2}$

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3 years ago

−px+r=−8x−2<br> solve for X

Arlecino [84]

-8x-2=0
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3 years ago

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What is the area of the parallelogram?

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Answer: D

Step-by-step explanation:

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What are the solutions to x2 - 2x -8=0?

pav-90 [236]

The answer is 2
Add like terms
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Then divide 4 and 8 by 4
To get x=2

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