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3 years ago

(a-1) a2-b2/1-ab+2(a-b)/2b a=2, b=-1

Mathematics

2 answers:

denis-greek [22]3 years ago

6 0

I hope this helps you

Lapatulllka [165]3 years ago

6 0

The answer is 10 hope this helped u

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Heather made a total of $451.78 last month at her part-time job. If she worked 14 hours, how much did she make per hour?

Step2247 [10]

The amount of money divided by the amount of hours will give you how much money she makes per hour.

451.78/14=32.27.

She earned $32.27 per hour.

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3 years ago

Plssss helppp me plsss

adelina 88 [10]

6 I think but maybe 1

4 0

3 years ago

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*20 points* Explain two barriers to entry for a new business.

Alex

Answer:

Government regulation, Economies of scale

Step-by-step explanation:

Barriers to entry are obstacles that make it difficult to enter a given market. ...

Government Regulation.

Start-Up Costs.

Technology.

Economies of Scale.

Product Differentiation.

Access to Suppliers and Distribution Channels.

Competitive Response.

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3 years ago

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A state end-of-grade exam in American History is a multiple-choice test that has 50 questions with 4 answer choices for each que

Assoli18 [71]

Answer:

Q1) The student has a 0.01% probability of passing the test.

Q2) She has a 99.91% probability of passing in the test.

Step-by-step explanation:

For each question, there are only two possible outcomes. Either he gets it correct, or he gets it wrong. So we solve this problem using the binomial probability distribution.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

$P(X = x) = C_{n,x}.\pi^{x}.(1-\pi)^{n-x}$

In which $C_{n,x}$ is the number of different combinatios of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

And $\pi$ is the probability of X happening.

For this problem, we have that:

Question 1.

There are 50 questions, so $n = 50$ .

The student is going to guess each question, so he has a $\pi = \frac{1}{4} = 0.25$ probability of getting it right.

He needs to get at least 25 question right.

So we need to find $P(X \geq 25)$ .

Using a binomial probability calculator, with $n = 50$ and $\pi = 0.25$ we get that $P(X \geq 25) = 0.0001$ .

This means that the student has a 0.01% probability of passing the test.

Question 2.

Now, we need to find $P(X \geq 25)$ with $\pi = 0.70$ . So $P(X \geq 25) = 0.9991$

She has a 99.91% probability of passing in the test.

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4 years ago

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Manuel is putting money into a savings account. He starts with

olga55 [171]

S=350 your starting amount + 30w which is 30× the number of weeks (19) which comes out to give you s=920 if I did it correctly

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3 years ago