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3 years ago

Using only words solve 8x+3=27 step by step

Mathematics

2 answers:

erik [133]3 years ago

5 0

Answer:

X=3

Step-by-step explanation:

Subtract 3 from both sides

Simplify 27-3 to 24

Divide both sides by 8

Simplify 24/8 to 3

ruslelena [56]3 years ago

3 0

Step-by-step explanation:

Your goal is to isolate x, so your first step is to subtract by 3 on both sides. That leaves you with the equation 8x=24. Divide by 8 on both sides (since x is being mutliplied b 8) and you get x=3

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2x - y when x = 0 and y = -5

nata0808 [166]

Answer:

Step-by-step explanation:

2x - y when x = 0 and y = -5

2(0) - (-5) =

= 0 + 5

= 5

3 0

2 years ago

Read 2 more answers

The perimeter of a rectangle is 22m. The length of the rectangle is 1 m less than three times the width Give me an equation and

aivan3 [116]

22/2=11( sum of both lengths)

4x-1=11
4x=12
x=3

length=8
width=3

8 0

3 years ago

Look at the table of values below.

Natalka [10]

Answer:

A. y = 1 - 2x

The equation y = 1 - 2x is represented by the table.

Step-by-step explanation:

In this question you are trying to find out which is the right equations that belongs to the table of values.

For any streight line, you need the minimum of two points (x,y) to be able to draw a line that accounts for all points on that line...

If you substitute x = 1 in any of the equations, the outcome should be -1 because that is given in the table.

So try it and you will you find solely based on one of the first value that, the equations in A. and C. could be valid, because the point with coordinates (1, -1) is on the line A. and also on C.

At this time you can totally discard equations B an D because the value of y = -1 is not the outcome if you substitute x = 1. You can absolutely cross out answers B an D. Please understand what a timesaver this is; for the next substitution you only need to subsymtitue one extra coordinate (x,y) and you only have to substitute it only in equations A and C.

Try one more point, to choose between answer A and answer C. Just pick the easiest value in the table.

Please understand that you could pick eighter the x value OR YOU COULD choose the y value. It just does not matter, because the coordinate (x,y) is a pair of two numbers which are bound together by the equation given and also by all values in the table... The question remains, how fast can you distinguish which is the right equation....

After substituting another value from the table, you find that only equation A. is valid and not C (and you already discarded answers B an D remember)....

So the equation y = 1 - 2x is represented by the table, which is answer A.

Although this is a lot of text explaining the simple steps of substituting a value of the table an checking if the coordinate is a member of the equation, I hope it will save you a lot of time in the future!

8 0

3 years ago

Ann has 30 jobs that she must do in sequence, with the times required to do each of these jobs being independent random variable

IgorLugansk [536]

Answer:

$P(T_A < T_B) = P(T_A -T_B$

Step-by-step explanation:

Assuming this problem: "Ann has 30 jobs that she must do in sequence, with the times required to do each of these jobs being independent random variables with mean 50 minutes and standard deviation 10 minutes. Bob has 30 jobs that he must do in sequence, with the times required to do each of these jobs being independent random variables with mean 52 minutes and standard deviation 15 minutes. Ann's and Bob's times are independent. Find the approximate probability that Ann finishes her jobs before Bob finishes his jobs".

Previous concepts

The central limit theorem states that "if we have a population with mean μ and standard deviation σ and take sufficiently large random samples from the population with replacement, then the distribution of the sample means will be approximately normally distributed. This will hold true regardless of whether the source population is normal or skewed, provided the sample size is sufficiently large".

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

Solution to the problem

For this case we can create some notation.

Let A the values for Ann we know that n1 = 30 jobs solved in sequence and we can assume that the random variable $X_i$ the time in order to do the ith job for $i=1,2,....,n_1$ . We will have the following parameters for A.

$\mu_A = 50, \sigma_A =10$

W can assume that B represent Bob we know that n2 = 30 jobs solved in sequence and we can assume that the random variable [tex[X_i[/tex] the time in order to do the ith job for $i=1,2,....,n_2$ . We will have the following parameters for A