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Sonbull [250]
3 years ago
13

Need help with math again ​

Mathematics
1 answer:
goblinko [34]3 years ago
3 0

Answer:

x=15

Step-by-step explanation:

x=√(12)²+(9)²

x=√144+81=√225

x=15units

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death valley has an elevation of -282 feet to relative to sea level.Explain how to use absolute value to describe the elevation
Vanyuwa [196]
Absolute value is the distance from a value to zero. In this case, it'd be written as   | -282 |. If x = | -282 |, then x = 282
5 0
3 years ago
What is the opposite of the number -2 1/3 ?
Katyanochek1 [597]
The opposite of the number -2 1/3 is 2 1/3 because if you look at a number line you will see that -2 1/3 and 2 1/3 are on opposite sides of the line
4 0
3 years ago
Read 2 more answers
How is the series 5+11+17…+251 represented in summation notation?
NISA [10]

Answer:

\displaystyle \large{\sum_{n=1}^{42}(6n-1)

Step-by-step explanation:

Given:

  • Series 5+11+17+...+251

To find:

  • Summation notation of the given series

Summation Notation:

\displaystyle \large{\sum_{k=1}^n a_k}

Where n is the number of terms and \displaystyle \large{a_k} is general term.

First, determine what kind of series it is, there are two main series that everyone should know:

  • Arithmetic Series

A series that has common difference.

  • Geometric Series

A series that has common ratio.

If you notice and keep subtracting the next term with previous term:

  • 11-5 = 6
  • 17-11 = 6

Two common difference, we can in fact say that the series is arithmetic one. Since we know the type of series, we have to find the number of terms.

Now that brings us to arithmetic sequence, we know that first term is 5 and last term is 251, we’ll be finding both general term and number of term using arithmetic sequence:

<u>Arithmetic Sequence</u>

\displaystyle \large{a_n=a_1+(n-1)d}

Where \displaystyle \large{a_n} is the nth term, \displaystyle \large{a_1} is the first term and \displaystyle \large{d} is the common difference:

So for our general term:

\displaystyle \large{a_n=5+(n-1)6}\\\displaystyle \large{a_n=5+6n-6}\\\displaystyle \large{a_n=6n-1}

And for number of terms, substitute \displaystyle \large{a_n} = 251 and solve for n:

\displaystyle \large{251=6n-1}\\\displaystyle \large{252=6n}\\\displaystyle \large{n=42}

Now we can convert the series to summation notation as given the formula above, substitute as we get:

\displaystyle \large{\sum_{n=1}^{42}(6n-1)

5 0
2 years ago
What are two decimals equivalent to 9.1
Marizza181 [45]
To get equivalent decimals you times the decimal by a number for example 2 
9.1x2= 18.2
or times it by 3 
9.1x3= 27.3
the answers are 18.2 and 27.3 and obviously other ones to...
i hope this helped :)
8 0
3 years ago
25 less than 4 times a number is 47. What is the number?
snow_tiger [21]

Answer:

18

Step-by-step explanation:

25 + 47 = 72

72 ÷ 4 = 18

5 0
3 years ago
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