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gavmur [86]
3 years ago
12

What are the solutions to the quadratic equation 5x2 – 8= –12x?

Mathematics
2 answers:
Tpy6a [65]3 years ago
8 0

djjdjdjeiwiwueuwhhww

zavuch27 [327]3 years ago
7 0
-1/6 or -0.166666667 (both work but first one is recommended.)
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There are 10 balls in an urn, numbered from 1 to 10. If 5 balls are selected at random and their numbers are added, what is the
Kisachek [45]

Let B_i denote the value on the i-th drawn ball. We want to find the expectation of S=B_1+B_2+B_3+B_4+B_5, which by linearity of expectation is

E[S]=E\left[\displaystyle\sum_{i=1}^5B_i\right]=\sum_{i=1}^5E[B_i]

(which is true regardless of whether the X_i are independent!)

At any point, the value on any drawn ball is uniformly distributed between the integers from 1 to 10, so that each value has a 1/10 probability of getting drawn, i.e.

P(X_i=x)=\begin{cases}\frac1{10}&\text{for }x\in\{1,2,\ldots,10\}\\0&\text{otherwise}\end{cases}

and so

E[X_i]=\displaystyle\sum_{i=1}^{10}x\,P(X_i=x)=\frac1{10}\frac{10(10+1)}2=5.5

Then the expected value of the total is

E[S]=5(5.5)=\boxed{27.5}

8 0
2 years ago
39. The diagram shows Luciana and Tanner's location
AlexFokin [52]

Answer:

2<d<8

Step-by-step explanation:

I have the same packet

4 0
3 years ago
Que es más gramos o miligramos ?
Anuta_ua [19.1K]
Los gramos son más de miligramos
7 0
3 years ago
Isabella's teacher said she must read more than 70 pages of her book by the end of the week. Isabella is able to read 12 pages o
AlexFokin [52]

Answer:

She must read more than 5 more hours.

Step-by-step explanation:

4 0
3 years ago
HELP ASAP
Mamont248 [21]

Answer:

m = 0

Step-by-step explanation:

distribute

7 + 35m + 2m = 7 +2m

add 35m + 2m

7 + 37m = 7 + 2m

subtract 2 from 37m

7 + 35m = 7

subtract 7 from 7

35m = 0

0 ÷ 35 = 0

so technically the answer is 0

I'm not 100% sure but I do believe this is right

3 0
3 years ago
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