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3 years ago

7

At the school carnival, Jade has a game booth with a spinner. The banner at her booth reads "80% chance of winning!" What is the

chance that a player may not win?
20%
40%
50%
60%

2 answers:

xxTIMURxx [149]3 years ago

5 0

Answer:

The chance it 20%

Step-by-step explanation:

To find it, we simply subtract the amount from 100%

100% - 80% = 20%

zzz [600]3 years ago

5 0

Answer:

the answer is 20

Step-by-step explanation:

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Factor the quadratic expression in the equation y=2x^2+28x+96 and use the factors to find the zeros of the equation. Then, use t

gavmur [86]

Answer:

$x=-7$

Step-by-step explanation:

We have been given an equation $y=2x^2+28x+96$ . We are asked to find the zeros of equation by factoring and then find the line of symmetry of the parabola.

Let us factor our given equation as:

$2x^2+28x+96=0$

Dividing both sides by 2:

$x^2+14x+48=0$

Splitting the middle term:

$x^2+6x+8x+48=0$

$(x^2+6x)+(8x+48)=0$

$x(x+6)+8(x+6)=0$

$(x+8)(x+6)=0$

Using zero product property:

$(x+8)=0\text{ (or) }(x+6)=0$

$x+8=0\text{ (or) }x+6=0$

$x=-8\text{ (or) }x=-6$

Therefore, the zeros of the given equation are $x=-8\text{ (or) }x=-6$ .

We know that the line of symmetry of a parabola is equal to the x-coordinate of vertex of parabola.

We also know that x-coordinate of vertex of parabola is equal to the average of zeros. So x-coordinate of vertex of parabola would be:

$\frac{-8+(-6)}{2}=\frac{-14}{2}=-7$

Therefore, the equation $x=-7$ represents the line of symmetry of the given parabola.

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3 years ago

-4x + 12 = 8<br><br> Solve for x

jasenka [17]

Answer:

x=1

Step-by-step explanation:

1.Move the constant to the right

2. Calculate

3. Divide both sides

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3 years ago

PLEASE HELP TIMED QUIZ

Karo-lina-s [1.5K]

Answer:

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3 years ago

Assume that 8% of people are left-handed. We select 6 people at random. a) How many lefties do you expect? b) With what sta

klemol [59]

Answer:

a) 0.48

b) 0.6645

c) 12.5

Step-by-step explanation:

For each person, there are only two possible outcomes. Either they are left-handed, or they are not. The probabilities of each person being left-handed are independent. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

Probability of exactly x sucesses on n repeated trials, with p probability.

The expected value of the binomial distribution is:

$E(X) = np$

The standard deviation of the binomial distribution is:

$\sqrt{V(X)} = \sqrt{np(1-p)}$

The number of trials expected to find r sucesses is given by

$N = \frac{r}{p}$

In this problem we have that:

Assume that 8% of people are left-handed. We select 6 people at random.

This means that $p = 0.08, n = 6$

a) How many lefties do you expect?

$E(X) = np = 6*0.08 = 0.48$

b) With what standard deviation?

$\sqrt{V(X)} = \sqrt{np(1-p)} = \sqrt{6*0.08*0.92} = 0.6645$

c) If we keep picking people until we find a lefty, how long do you expect it will take?

Number of trials to find 1 success. So

$N = \frac{r}{p} = \frac{1}{0.08} = 12.5$

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3 years ago

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Archy [21]

Answer: The actual distance is 6 km

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$\frac{1cm}{20km} = \frac{0.1cm}{km ?}$

So, if you solve for km, you will get 6 using cross multipulcation

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3 years ago