All categories

2 years ago

How many nonzero elements are in the matrix below?

Mathematics

2 answers:

yawa3891 [41]2 years ago

8 0

we will find number of non-zero elements on each rows

and then we add them

First row:

we can see that non-zero elements are

2 , 3.1 , 22 , 9

so, number of non-zero elements in first row =4

Second row:

we can see that non-zero elements are

21 , 3.2 , 6

so, number of non-zero elements in first row =3

Third row:

we can see that non-zero elements are

1 , 42 , 8

so, number of non-zero elements in first row =3

Fourth row:

we can see that non-zero elements are

40 ,4 , 6,14

so, number of non-zero elements in first row =4

Fifth row:

we can see that non-zero elements are

10 , 20 , 13 , 5 , 6.3

so, number of non-zero elements in first row =5

now, we can add them

so,

total number of non-zero elements = 4 +3+3+4+5

so,

total number of non-zero elements is 19...........Answer

Murrr4er [49]2 years ago

4 0

Answer:

c.............................................................

Step-by-step explanation:

just took test

You might be interested in

Mary is a scientist. Using a microscope, she looks at a salt crystal and discovers it is shaped like a cube. Each square face ha

Annette [7]

<h2>Explanation:</h2>

A cube is a prism whose sides all have the same length. You can think of a cube like the three dimensional version of a square. In this problem, we know that Mary is using a microscope in order to look at a salt crystal and discovers it is shaped like a cube. Each square face has side length:

$s=0.1mm$

This diagram is shown in the first figure below. A crystal's square face is one of the six faces of the cube. So in order to draw it we need to know how many units we'll have in each side. Since we know that 1 unit on the grid represents 0.01mm, then:

$No. \ units=\frac{0.1mm}{0,01mm}=10$

So we will have 10 units that measure 0.01mm in each side. This is shown in the second figure below.

5 0

2 years ago

John took all his money from his savings account. He spent $110 on a radio and 4/11 of what was left on presents for his friend

svp [43]

Answer:

$1210

Step-by-step explanation:

Let x be total amount

First John spent $110 on a radio and 4/11 of what was left on presents for his friends so he was left with

$\frac{7}{11}(x-110)=\frac{7}{11}x-70$

Then he put 2/5 of his remaining money into a checking account

$\frac{3}{5}\left(\frac{7}{11}x-70\right)$

Rest he donated to charity

$420=\frac{3}{5}\left(\frac{7}{11}x-70\right)\\\Rightarrow \left(\frac{7}{11}x-70\right)=\frac{2100}{3}\\\Rightarrow \frac{7}{11}x-70=700\\\Rightarrow \frac{7}{11}x=770\\\Rightarrow x=1210$

Hence total amount of money John originally had was $1210

8 0

1 year ago

What is the GCF of 16s3t, 40s5, and 68t2? 4 4s3t 8 8s3t

Gemiola [76]

4 is the only factor common among all terms

3 0

2 years ago

Read 2 more answers

The histogram shows the number of cell phone calls received by Medera, a middle school student, one Saturday from 10 a.m. to 10

Anni [7]

Answer:

The hours when zero calls were received were most possibly when Madera turned the phone off while playing in a soccer game.

Step-by-step explanation:

According to the question,

Madera, a middle school student, received some phone calls on one Saturday from 10 a.m. to 10 p.m.

The hours when zero calls were received were most possibly when Madera turned the phone off while playing in a soccer game.

4 0

2 years ago

Read 2 more answers

Create a set of 5 positive numbers (repeats allowed) that have median 7 and mean 10.

damaskus [11]

Answer:

Step-by-step explanation:

Two cases arise to obtain the median.

Case (1): Sample size (n) is odd

First, arrange the data in ascending order. Then, the median is the middle value and lies at the ${\left( {\frac{{n + 1}}{2}} \right)^{{\rm{th}}}}$ position.

Case (2): Sample size (n) is even

First, arrange the data in ascending order. Then, the median is the mean of the two data values that lie on and positions.

Formula for mean is, where is the sum of all observations and n is the total number of observations.

(1)

Use the below process to create a set of 5 positive numbers (repeats allowed) that have median 7 and mean 10.

1.Select the 5 ordered numbers with middle value 7.

2.Adjust the remaining 4 numbers other than 7 to get mean 10 without changing the order of the numbers.

Based on the process to select the 5 ordered numbers with middle value 7 and change the other ordered numbers to get the mean value 10.

(2)

The product of the mean and the total number of observations is obtained. Then, the sum of four observations is subtracted from the product.

Here, the first four numbers are (5, 6, 7, 8).

The last number by using mean 10 is,

$\begin{array}{c}\\\bar x = \frac{{5 + 6 + 7 + 8 + a}}{5}\\\\10 = \frac{{5 + 6 + 7 + 8 + a}}{5}\\\\50 = 26 + a\\\\a = 50 - 26\\=24\end{array}$

The last number is 24.

6 0

2 years ago