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defon
4 years ago
11

Which number rounds to 42.7 when rounded to the nearest tenth?

Mathematics
2 answers:
andreev551 [17]4 years ago
5 0

Answer:

c

Step-by-step explanation:

pochemuha4 years ago
5 0
The answer is B. 42.68
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For the equation x2 = a, describe the values of a that will result in two real solutions, one real solution, and no real solutio
Tasya [4]
The equation given is x^{2} =a where a is some number.
We can solve for x by taking the square root of both sides.

x=plusminus \sqrt{a}

Now let's think through what happens for various values of a.

TWO SOLUTIONS
If a is a positive number the above yields two solutions. Take for example:
x^{2} =49
 \sqrt{49}=7 or -7
There will be two solutions (one positive and one negative) as there are two numbers (here -7 and +7) that when multiplied by themselves give 49. That is, 7^{2} =49 and (-7)^{2}=49. The positive root is called the principal root and the negative root is called the secondary root. This will be the case anytime we take the root of a positive number.

ONE SOLUTION
If a = 0 there is only one solution. That is because x^{2} =0 and x= \sqrt{0}. Zero is neither positive nor negative and it has only one root which is 0 itself. So in this case there is only one solution and it is 0.

NO (REAL) SOLUTIONS
If a is negative we would be taking the square root of a negative number. There is no (real) number that when multiplied by itself gives a negative number. Take for example x^{2} =-49 which gives us x= \sqrt{-49}. The square root of -49 is not 7 because (7)(7)=49 which is positive. The square root of -49 is not -7 because (-7)(-7)=49 which is also positive. There is no real number that gives -49 when multiplied by itself. I say "real" numbers because there do exist imaginary/complex numbers but because of the way the questions was asked I imagine you may not know about these yet.
7 0
4 years ago
What Values of X Makes these equations true?<br><br> Label Them as <br> 1.<br> 2.
maks197457 [2]

Answer: your answer is answer

Step-by-step explanation; the physics of the calculations say you are not einstien.

4 0
3 years ago
Read 2 more answers
Explain how to write and evaluate an algebraic expression. one more than the product of a number and seven, decreased by five; e
Cloud [144]
1) When it says more than, then you have to switch it so it will be 7n + 1 instead of 1+7n.
2) Because you then have to subtract by 5 you have to put the 7n + 1 in parentheses so it reads (7n + 1) - 5
3) And then to evaluate you just have to substitute n for 6
4) 7 * 6 = 42; 42+1 = 43; 43-5 = 38
5) The answer to this expression would be 38

Hope it helps :)

Please give brainliest
7 0
3 years ago
Read 2 more answers
Sam is thinking of retiring from his job after many years of faithful service. during the last 35 years at his job, his annual s
Lelechka [254]

Using proportions, the amount of money that Sam would need each month to pay his bills is of:

b. at least $425.32.

<h3>What is a proportion?</h3>

A proportion is a fraction of a total amount, and the measures are related using a rule of three.

In this problem, his annual social security benefit is of 42% of $37,991, hence:

A = 0.42 x 37991 = $15,956.22.

Hence the monthly amount is given by:

M = 15956.22/12 = $1,329.68

He needs $1,755 monthly, hence the amount he needs is of at least:

An = 1755 - 1329.68 = $425.32.

Which means that option b is correct.

More can be learned about proportions at brainly.com/question/24372153

#SPJ4

5 0
2 years ago
What combination of variables could you analyze using correlation?
Anon25 [30]

Answer:

YOu have to add them i think

Step-by-step explanation:

First add the 3-4 and then finish it

3 0
3 years ago
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