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Alborosie
2 years ago
13

How do I solve problems like this? I did it last year, but I don't remember how to do it.

Mathematics
2 answers:
Scorpion4ik [409]2 years ago
7 0
1/2x +3 = 7
-3 -3
1/2x=4 divide both sides by 1/2
x=2
2x + 3 -4x -7 =11
-2x -4 =11
+4 +4
-2x=15 divide both by -2
x= -7.5
ExtremeBDS [4]2 years ago
6 0

Answer:

8

Step-by-step explanation:

I do not know the details of the work but if it's a simple "Solve for x" question, you're not quite right.

1/2x+3=7

1/2x= 4

x= 8

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Can somebody please help me
Ksenya-84 [330]

Answer:

......................................................

Step-by-step explanation:

8 0
3 years ago
Simplify: 3m over m-6 •5m3 - 30m2 over 5m2
vfiekz [6]
\frac{3(5m^{4}-2m +12)}{m-6} should be the right answer
3 0
2 years ago
A random sample of 18 graduates of a certain secretarial school typed an average of 80.6 words per minute with a standard deviat
insens350 [35]

Answer: ( 77.27 , 83.93)

Therefore at 95% confidence/prediction interval is

= ( 77.27 , 83.93)

Step-by-step explanation:

Confidence interval can be defined as a range of values so defined that there is a specified probability that the value of a parameter lies within it.

The confidence interval of a statistical data can be written as.

x+/-zr/√n

Given that;

Mean x = 80.6 words per minute

Standard deviation r = 7.2

Number of samples n = 18

Confidence interval = 95%

z(at 95% confidence) = 1.96

Substituting the values we have;

80.6+/-1.96(7.2/√18)

80.6+/-1.96(1.697056274847)

80.6 +/- 3.33

= ( 77.27 , 83.93)

Therefore at 95% confidence/prediction interval is

= ( 77.27 , 83.93)

7 0
3 years ago
Write the equation in standard form. then factor the left side of the equation 2x^2=28-x
miskamm [114]
2x^2 = 28 - x in standard form is 2x^2 + x = 28

Factoring, we have:
x(2x + 1) = 28
8 0
3 years ago
there are 225 wolves in a state park the population is increasing at the rate of 15% per year you want to make a prediction for
erastova [34]
Well, here is how i would do it.

We start with 225, at a rate of 15% per year. Assuming your answers are in years and not months, we will increase by this increment; years.

So, we start with 225, and a 15%, or .15, increase. So what we would do, it take 225 times .15. One way ive learned to do this (via algebra class) is that you can times it by 1.15 to make it quicker, this just takes out the adding step.

So after one year, we would have a total of 258.75, or about 259 wolves.

after two years, we would have about 298 (we cant have a half of a wolf!)

after 3 years, we would have about 343 wolves.

after 4 years, we would have about 394 ish

after 5 years, we would have about 453

after 6 years, we would have about 521.

So, it would take about 5 and a half years, if thats an option choice.

 
6 0
3 years ago
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