This is all about matrices, I don't really get them. Any help is great.

Answers

Answer 1

Answer:

See Explanation

Step-by-step explanation:

$\begin{bmatrix} - 3 & 5 & 6\n-3 & 0 & - 3\end{bmatrix} -\begin{bmatrix} 6 & - 1& 1\n0& - 4& - 5\end{bmatrix} \n\n=\begin{bmatrix} - 3-6 & 5-(-1) & 6-1\n-3-0 & 0-(-4) & - 3-(-5)\end{bmatrix} \n\n=\begin{bmatrix} - 3-6 & 5+1 & 6-1\n-3-0 & 0+4 & - 3+5\end{bmatrix} \n\n=\begin{bmatrix} - 9 & 6 & 5\n-3 & 4 & 2\end{bmatrix} \n\n$

$\begin{bmatrix} 4 & - 6 \n-3 & - 6\n2 & 6 \end{bmatrix} + \begin{bmatrix} 5 & 3 \n-5 & 5\n 4 & - 5\end{bmatrix} \n\n= \begin{bmatrix} 4 +5& - 6+3 \n-3+(-5) & - 6+5\n2+4 & 6+(-5) \end{bmatrix} \n\n= \begin{bmatrix} 4 +5& - 6+3 \n-3-5 & - 6+5\n2+4 & 6-5 \end{bmatrix} \n\n= \begin{bmatrix} 9& - 3 \n-8 & - 1\n6 & 1\end{bmatrix} \n\n$

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HELP ME LOOK AT THE PICTURE

A grocer stacks oranges in a four-sided pyramid that is 7 layers high. How many oranges are in the pile? A.504 B.840 C.140 D.120

Answers

Answer:

Option C. 140

Step-by-step explanation:

Base of a pyramid which has four triangular sides is four sided.

If pyramid contains seven layers of oranges then the layer at the bottom will have 7 oranges.

Since base is a square then other side of the square base will have the same number of oranges = 7.

Therefore number of oranges at the first layer will be = 7×7

Similarly other layers above this layer will have the same sequence

6×6, 5×5, 4×4, 3×3, 2×2, 1×1

Therefore total number of oranges = 7×7 + 6×6 + 5×5 + 4×4 + 3×3 + 2×2 + 1×1 = 49 + 36 + 25 + 16 + 9 + 4 + 1 = 140

Option C. 140 is the answer.

A grocer stacks oranges in a four-sided pyramid that is 7 layers high. Many oranges are in the pile are C.140

Further explanation

The orange is the fruit of the citrus species Citrus and sinensis in the family Rutaceae, native to China. Orange is also called sweet orange, to distinguish it from the related Citrus and aurantium, referred to as bitter orange.

The proper name of four-sided pyramid is a "tetrahedron". The tetrahedron has the extra interesting property of having all four triangular sides congruent

1st Layer: The 1st layer contains only 1 orange so it has only 1 orange

2nd layer: The 2nd layer has total 4 oranges. Calculation: $2*2=4$

3rd layer: The 3rd layer has total 9 oranges. Calculation: $3 * 3 = 9$

4th Layer: The 4th layer has total 16 oranges. Calculation: $4 * 4 = 16$ .

5th layer: The 5th layer has total 25 oranges. Calculation: $5 * 5 = 25$

6th layer: The 6th layer has total 36 oranges. Calculation: $6 * 6 = 36$

7th layer: The 7th layer has total 49 oranges. Calculation: $7 * 7 = 49$ .

Sum of all layers:

$1+4+9+16+25+36+49 = 140$

Learn more

Learn more about oranges brainly.com/question/10744522
Learn more about pyramid brainly.com/question/10262815
Learn more about pile brainly.com/question/9094265

Answer details

Grade: 9

Subject: mathematics

Chapter: pyramid

Keywords: oranges, pyramid, four-sided, layers, pile

The South Memorial School is designing a new playground. There will be a walkway that diagonally crosses the square playground. The walkway is 55 meters long.Find the length of one side. Round your answer to the nearest 10th.

Answers

The playground is a square, so there will be a right triangle formed by diagonal and two sides. So sides length²*2=diagonal length². So the side length is 38.9 meter.

There is an "X" drawn on a sheet of paper. One of the smaller angles created is 57 degrees. What are the other 3 angle measures? What are the two typed of angle pairs we need to use?

Answers

in total the answer has to be 180 degrees so the other 2 angels would be any 2 numbers that when you add them and 57 together you get 180

What is the rate of change of the function enter as a fraction

marking brainlist

Answers

Answer:

The rate of function is: 5/2

Step-by-step explanation:

As we know that the rate of change of a function is a ratio that compares the difference between the output values to the difference between the corresponding input values

rate of change = change in y-values / change in y-values

So, all we need is to find the slope between any two points as the slope is basically termed as the rate of change.

$\mathrm{Slope}=(y_2-y_1)/(x_2-x_1)$

$\left(x_1,\:y_1\right)=\left(-5,\:18\right),\:\left(x_2,\:y_2\right)=\left(-3,\:23\right)$

$m=(23-18)/(-3-\left(-5\right))$

$m=(5)/(2)$

Thus, the rate of function is: 5/2

Donna's company reimburses her expenses on food, lodging, and conveyance during business trips. The company pays $50 a day for food and lodging and $0.60 for each mile traveled. Donna drove 200 miles and was reimbursed $1,620. Part A: Create an equation that will determine the number of days on the trip. (3 points) Part B: Solve this equation justifying each step with an algebraic property of equality. (6 points) Part C: How many days did Donna spend on this trip? (1 point)

Answers

Answer:

See below

Step-by-step explanation:

Part A

Let number of days be d, then the equation is:

50d + 200*0.6 = 1620

Part B

Solution of the equation

50d + 120 = 1620
50d + 120 - 120 = 1620 - 120 ⇒ subtraction property of equality
50d = 1500
50d / 50 = 1500/50 ⇒ division property of equality
d = 30

Part C

30 days as above

How do I solve for x? log (x-2) = -1 + log (x+1)

Answers

For this question you can say:
log(x-2) - log(x+1) = -1
and you should know that log(x-2) minus log(x+1) is equal to:
log((x-2)/(x+1))
so now you have:
log((x-2)/(x+1)) = -1
now you can say:
(x-2)/(x+1) = 10^ -1 or (x-2)/(x+1) = 1/10
now you can say:
10(x-2) = x+1
10x -20 = x +1
10x - x = 20+1
9x = 21
x = 21/9
x = 7/3 :)))
I hope this is helpful
have a nice day

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