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3 years ago

12

A bag contains 4 red, 3 green and 2 blue marbles. What is the probability of selecting a green marble and then a blue marble ass

uming you replace the first marble?

1 answer:

TiliK225 [7]3 years ago

5 0

1st of all, this makes my brain hurt

2nd of all, which one was the first marble?

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What are the roots of the quadratic equation 2x2+7x+4=0? Select all that apply.

skad [1K]

Answer:

option A and B

$x=\frac{-7+\sqrt{17}} {4}$

and

$x=\frac{-7-\sqrt{17}} {4}$

Step-by-step explanation:

we have

$2x^2+7x+4=0$

The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

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

in this problem we have

$2x^2+7x+4=0$

so

$a=2\\b=7\\c=4$

substitute in the formula

$x=\frac{-7\pm\sqrt{7^{2}-4(2)(4)}} {2(2)}$

$x=\frac{-7\pm\sqrt{17}} {4}$

so

$x=\frac{-7+\sqrt{17}} {4}$

and

$x=\frac{-7-\sqrt{17}} {4}$

7 0

2 years ago

Please help quick for 25 points with explanations. Any silly and absurd answers will be reported.

amid [387]

Answer:

Note that the tangents to the circles at A and B intersect at a point Z on XY by radical center. Then, since∠ZAB=∠ZQA and ∠ZBA=∠ZQB. ∠AZB+∠AQB=∠AZB+∠ZAB+∠ZBA=180°. ∴ZAQB is cyclic.But if O is the center of w, clearly ZAOB is cyclic with diameter ZO, so ∠ZQO is 90° ⇒Q is the mid-point of XY.Then, by Power of a Point, PY· PX = PA · PB = 15 and it is given that PY+PX = 11. Thus,PX=(11± $\sqrt{61}$ )/2. So, PQ= $\frac{\sqrt{61} }{2}$ , PQ²= $\frac{61}{4}$ . Thus, the answer is 61+4=65.

Step-by-step explanation:

4 0

3 years ago

2/5 vs. 3/8 which is bigger/smaller

vova2212 [387]

2/5 is bigger and 3/8 is smaller

6 0

3 years ago

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Andrew was working on a project for Science class. He began working on the project at 10:32 a.m. When he finally

Amanda [17]

Answer:

3 hours 43 minutes

3 0

3 years ago

Read 2 more answers

A football stadium has 9,607 seats. At one game, people sat in 7,599 of the seats. How many seats were empty? What is the total

Mila [183]

9607-7599= 2008

So there are 9607 seats

7599 were full

Then that leaves 2008 seats empty

7 0

3 years ago