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NeTakaya
3 years ago
11

Solve the expression for a=12, b=6 and c=3 Look at the picture will give Brainlist !

Mathematics
2 answers:
Aleonysh [2.5K]3 years ago
7 0

Step-by-step explanation:

\frac{  {a}^{2}  - bc}{b} =  \frac{ {12}^{2}  - 6 \times 3}{6}  =  \frac{144 - 18}{6}  =  \frac{126}{6}  = 21

photoshop1234 [79]3 years ago
6 0

Answer:

a=1 c=3 b=3

Step-by-step explanation:

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Answer:

Step-by-step explanation:

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The sum of two numbers is 28<br> and their product is 180.<br> Find the numbers.
zubka84 [21]
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Read 2 more answers
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

4 0
3 years ago
What is the slope of the graph?
Keith_Richards [23]

Use the coordinates of the two black dots:

(2,3) and (7,6)

Slope is the change in Y over the change in X:

Slope = (6-3) / (7-2)

Slope = 3/5

4 0
3 years ago
The graph of f(x) is obtained by reflecting the graph of g(x)=3|x| over the x-axis.
Alinara [238K]

Answer:

Choice B), f(x) = -3|x|.

Step-by-step explanation:

Each point on the graph of g(x) can be represented as (x, g(x)).

When the graph of g(x) is reflected over the x-axis, each point on the graph is also reflected over the x-axis. The x-coordinate of each point will not change but the sign in front of the y-coordinate will flip. For example, 1 (same as +1) will become -1, and vice versa. In general, (x, g(x)) will become (x, -g(x)).

On the other hand, points on the graph of f(x) can be represented as (x, f(x)). f(x) is the reflection of g(x), so (x, -g(x)) and (x, f(x)) shall be equivalent. In other words,

f(x) = -g(x) = - 3|x|.

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3 years ago
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