All categories

3 years ago

Evaluate each expression |18||2|+|-13|=|-20|-|17|=

1 answer:

7 0

$|a|= \left\{\begin{array}{ccc}a&for\ a\geq0\\-a&for\ a \ \textless \ 0\end{array}\right\\\\|2|+|-13|=2+13=15\\\\|-20|-|17|=20-17=3$

You might be interested in

Please help on one math question

kipiarov [429]

Hello from MrBillDoesMath!

Answer:

225

Discussion:

Sum ( 2n - 1) from n = 1 to 15

= Sum(2n) - Sum(1) from n = 1 to 15

= 2 Sum(n) - Sum(1) from n = 1 to 15

= 2* 15(15+1)/2 - (1 + 1 + .. + 1)

The first value comes from the fact that the sum of the first n integers is n(n+1)/2. The latter value sums 15 1's.

= 2 * 15 * 16/2 - 15 => 2/2 = 1

= 15*16 - 15 => 15*16 = 240

= 240 - 15

= 225

Thank you,

MrB

6 0

3 years ago

Read 2 more answers

Last year, a person wrote 126 checks. Let the random variable x represent the number of checks he wrote in one day, and assume

Arisa [49]

Answer: The mean number of checks written per day $=0.3452$

Standard deviation $=0.5875$

Variance $=0.3452$

Step-by-step explanation:

Given : The total number of checks wrote by person in a year = 126

Assume that the year is not a leap year.

Then 1 year = 365 days

Let the random variable x represent the number of checks he wrote in one day.

Then , the mean number of checks wrote by person each days id=s given by :-

$\lambda=\dfrac{126}{365}\approx0.3452$

Since , the distribution is Poisson distribution , then the variance must equal to the mean value i.e. $\sigma^2=\lambda=0.3452$

Standard deviation : $\sigma=\sqrt{0.3452}=0.5875372328\approx0.5875$

6 0

4 years ago

What is the area of a rectangular driveway measuring 20 feet long & 15 feet wide

Stels [109]

Answer:

2 x 20 + 2 x 15 = 40 + 30 = 70

Step-by-step explanation:

2x20=40

2x15=30

40+30=7

6 0

4 years ago

Read 2 more answers

What is 0.08333333333 as a fraction in the simplest form

Sergio [31]

The answer in simplest form would be 5/6

8 0

4 years ago

Read 2 more answers

-7x - 2y = -13<br><br>-8x - 2y = -11<br><br>How do I solve?

dusya [7]

Answer:

(−2,27/2)

Step-by-step explanation:

4 0

3 years ago