MATHEMATICS MIDDLE SCHOOL

Which of the following is the product matrix AB

Answers

Answer 1

Answer:

Answer:

The answer is (B)

Step-by-step explanation:

* At first we must now the dimensions of the matrix AB

- If we have two matrices the first of dimension m × n

and the other of dimension p × q, the multiplication is

exist if n = p and the dimension of the answer is m × q

∵ The dimension of matrix A is 3 × 2

∵ The dimension of matrix B is 2 × 2

∴ The dimension of AB will be 3 × 2

* From the answer we have only 2 answers have the same

dimension, answer B and answer D

- To find each element in AB we will multiply each raw

in A with each column in B lets do it

∵ 1 × 1 + (-4) × (-2) = 1 + 8 = 9 ⇒ 1st raw , 1st column

∵ 1 × 7 + (-4) × 11 = 7 - 44 = -37 ⇒ 1st raw , 2nd column

∵ (-3) × 1 + 2 × (-2) = -3 - 4= -7 ⇒ 2nd raw , 1st column

∵ (-3) × 7 + 2 × 11 = -21 + 22 = 1 ⇒ 2nd raw , 2nd column

∵ 7 × 1 + (-5) × (-2) = 7 + 10 = 17 ⇒ 3rd raw , 1st column

∵ 7 × 7 + (-5) × 11 = 49 - 55 = -6 ⇒ 3rd raw , 2nd column

* AB = $\left[\begin{array}{ccc}9&-37\n-7&1\n17&-6\end{array}\right]$

* The answer is (B)

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Plz help me i dot know what to do Describe how the diagram models the problem. In your own words, what is valuable about the diagram?

Answer in at least 3 complete sentences.

Answers

What it is showing is that you need 6 faces to make one bottle. So, if the problem is how many faces are in 6 bottles then you would explain multiplying the 6 by 6 to get 36. But I’d the problem is how many bottles can you make with __ faces then you use the two sentences to explain dividing. I am going to go with my first example to show you what it could look like. “What is it showing is that you need 6 faces to make 1 bottle. So 6x6=36. So, the answer is 36.” :)

the sum of two numbers is 158.if we add 25 to each one of them,then the first becomes the triple of the other.what are these numbers

Answers

Answer:

Why is 90 the sum of all factors of 40, including 40? The factors of the number 40 are: 1, 2, 4, 5, 8, 10, 20, 40. If you add them up, you will get the total of 90.

Step-by-step explanation:

2. Given the points A, B, C, D, calculate:

(a) the angle B of the triangle ABC

(b) the area of the triangle ABC

(d) the height AH of the triangle ABC

(e) the volume of tetrahedron ABCD

(f) the point E so that ABCE is a parallelogram.

A(-1, 2, -3), B(4, -1, 0), C(2, 1, -2), D( 3,4,5)

Which choice shows the image of triangle abc

Answers

I'm pretty sure that it would be the middle one as, if we read the graph as the top-left coordinate plane as 1, the top, right coordinate plane as 2, the bottom-left coordinate plane as 3, and the bottom-right coordinate plane as 4...

Your initial ABC triangle (being in the coordinate plane of 1) would flip over the y-axis, placing it into the coordinate plane of 2. By turning 180 degrees, it sends it to coordinate plane 3.

hope this helps :)

Write 0.0000145 as scientific notation

Answers

1.45 times 10^5 is the scientific notation of that

♡ The Question/Task ♡

Write 0.0000145 as scientific notation.

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♡ The Answer ♡

1.45 x 10^5

*୨୧ ┈┈┈┈┈┈┈┈┈┈┈┈ ୨୧*

♡ The Explanation/Step-By-Step ♡

No Explanation/Step-By-Step provided!

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♡ Tips ♡

No tips provided!

10. angle GHI is an isosceles triangle with GI HI. IF GH is three more than x, HI is 17 less than fourtimes x, and GI is 45 less than six times x, find x and the measure of each side.

Answers

Answer:

GH = 17 units

GI = 39 units

HI = 39 units

Step-by-step explanation:

We are given the following information in the question:

Triangle GHI is an isosceles triangle.

$GI = HI$

The measures of side are:

$GH = 3 + x\nHI = 4x-17\nGI = 6x - 45$

It is given that

GI = HI

$4x - 17 = 6x -45\n6x - 4x = 45-17\n2x = 28\nx = 14$

Thus, the measures of three sides are:

$GH = 3 + x=14+3 = 17\nHI = 4x-17 = 4(14)-17 = 39\nGI = 6x - 45=6(14) - 45 = 39$

A cup of cereal can contain 480480
milligrams of salt, which is 20%
20
%
of the recommended daily amount.

What is the recommended daily amount of salt?

Answers

480 x 5 = 2400. 2400 milligrams of salt is the recommended daily amount.

Answer:

2400 milligrams because 480 is 20% of the recommended amount

Step-by-step explanation:

20*5 = 100% so 480* 5 = 100% or recommended amount

Hope this helps!

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