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4 years ago

Can someone help with this story problem?

Mathematics

2 answers:

denis23 [38]4 years ago

8 0

Since she has 100 dollars already she only needs 200. since she makes 3 dollars an hour it will take about 67 hours

kotykmax [81]4 years ago

6 0

It will take he 64 this is because it is redundant the the amount spent

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A system of linear equations with more equations than unknowns is sometimes called an overdetermined system. Can such a system b

shepuryov [24]

Answer:

A. Yes, overdetermined systems can be consistent.

As, the system of equations below is consistent because it has a solution

$x_{1}=2$ , $x_{2}=4$ , $x_{1}+x_{2}=6$ .

Step-by-step explanation:

We have,

'Over-determined system is a system of linear equations, in which there are more equations than unknowns'.

For e.g. Let us consider the system,

2x - 3y = 1

3x - 2y = 4

x - y = 1

Plotting these equations, we see from the graph below that,

The only intersection point is (2,1). Thus, x= 2 and y= 1 is the solution of this system.

Thus, over-determined system can be consistent.

According to the options,

Option C is not correct as,

$x_{1}=2$ , $x_{2}=4$ implies $x_{1}+x_{2}=2+4=6\neq 8$ .

Hence, option A is correct.

7 0

3 years ago

Suppose that a stock is currently selling for $100. The change in the stock's price during the next year follows a normal random

Basile [38]

Answer:

The probability that the stock will sell for $85 or less in a year's time is 0.10.

Step-by-step explanation:

Let X = stock's price during the next year.

The random variable X follows a normal distribution with mean, μ = $100 + $10 = $110 and standard deviation, σ = $20.

To compute the probability of a normally distributed random variable we first need to compute the z-score for the given value of the random variable.

The formula to compute the z-score is:

$z=\frac{X-\mu}{\sigma}$

Compute the probability that the stock will sell for $85 or less in a year's time as follows:

Apply continuity correction:

P (X ≤ 85) = P (X < 85 - 0.50)

= P (X < 84.50)

$=P(\frac{X-mu}{\sigma}$

$=P(Z$

*Use a z-table for the probability.

Thus, the probability that the stock will sell for $85 or less in a year's time is 0.10.

6 0

3 years ago

Which expression has a value of 39?

Ludmilka [50]

I think the answer to this one would be B

4 0

2 years ago

The function y = 400(0.75)* models the amount in milligrams of pain reliever, y. remaining in a patient's bloodstream x hours af

Schach [20]

Step-by-step explanation:

y = 400 × 0.75

y = 300

300 milligrams = 0.75 hours

x = 3 hours

3(300) = 0.75x

900 = 0.75x

x = 1200

7 0

3 years ago

12 balls numbered 1 through 12 are placed in a bin. In how many ways can 3 balls be drawn, in order, from the bin, if each ball

Iteru [2.4K]

Answer:

1320

Step-by-step explanation:

There are three "spots" for balls.

__ __ __

For the first "spot," and without replacement, meaning we don't put the balls back, there are 12 choices.

12 __ __

But for the next spot, there are only 11 choices. And for the next, there are only 10!

12 11 10

Since these are independent events, we multiply them together.

12 x 11 x 10 = 1320

There are 1320 possibilities!

How could we do it on the calculator, much faster? The question says "in order," so we know it's a permutation, not a combination. This is the nPr button on the calculator (math -> prb -> 2). Just type in 12 nPr 3 and you get the same answer, 1320.

3 0

3 years ago