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3 years ago

Solve for x: 2x^2+3x=2

Mathematics

2 answers:

Mariulka [41]3 years ago

7 0

Answer:

The answer should be -2/5

Step-by-step explanation:

Hope this helps

Have a great day

vekshin13 years ago

6 0

Answer:

x = 0.5

x = -2

Step-by-step explanation:

Have a great day :)

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a couch ,a love seat,and a chair cost $1565.the couch costs twice as much as the chair,and the love seat costs $ 400 more than t

Art [367]

I'm guessing you are having a problem with translating the problem into an equation you can solve. To help this what you can first do is underline the important parts of this problem. twice as much, 400 more,
Lets look at this
First Let the chair=x
Next we know the couch cost twice as much as the chair
So now we know we should let the couch=2x
Lastly the love seat is 400 more than the couch. couch+400is the same thing as saying 2x+400
NOw 1565=chair(x)+couch(2x)+love seat(2x+400)
So that means 1565=x+2x+2x+400
Combine like terms and you now have 1565=5x+400
Now you isolate the variable by subtracting 400 from both sides which is 1165=5x Then you divide both sides by 5 and get 223=x

5 0

3 years ago

Keisha wants to estimate the percentage of managers at her company that hold an MBA. She surveys 320 managers and finds that 70

kondor19780726 [428]

Answer:

The margin of error is of 0.038 = 3.8%.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

For this problem, we have that:

$n = 320, \pi = \frac{70}{320} = 0.21875$

90% confidence level

So $\alpha = 0.1$ , z is the value of Z that has a pvalue of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$M = 1.645\sqrt{\frac{0.21875(1-0.21875)}{320}}$

$M = 0.038$

The margin of error is of 0.038 = 3.8%.

6 0

4 years ago

IS this table linear?? Can someone please explain???? What would the weight be if the number of weeks in the fitness program was

boyakko [2]

Answer:

not linear
somewhere between 184 and 186 (maybe)

Step-by-step explanation:

As you show, the weight differences are different for the same week differences, so the table is not linear. A graph (attached) can also show you the table is not linear.

The highest rate of weight loss shown in the table is 7 lbs in 3 weeks, or 4 2/3 pounds in 2 weeks. The lowest rate of weight loss shown in the table is 5 lbs in 3 weeks, or 3 1/3 pounds in 2 weeks. Based on the rates shown in the table, we might expect the starting weight to be between 3 1/3 and 4 2/3 pounds more than the first table value:

Week 0 weight: between 184 1/3 and 185 2/3 lbs, estimated.

_____

A "line of best fit" for the data has a y-intercept of about 185 pounds, which is the midpoint between our two estimates above.