Let A and B be arbitrary matrices for which the indicated product is defined. Determine whether the statement below is true or false. Justify the answer. If A and B are 2 x 2 with column a1,a2 and b1, b2 respectivley then AB= [a1b1, a2b2]

Each column of AB is a linear combination of the columns of B using weights from the corresponding column of A.

a. True
b. False

Answer:

x = 4

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Equality Properties

Algebra I

Step-by-step explanation:

Step 1: Define

-(8x + 3) = -23 - 3x

Step 2: Solve for x

The sum of the measures of the interior angles of a 20-sided figure is 3240.

What are Interior angles ?

An interior angle of a polygon is an angle that is created between two of the polygon's adjacent sides. The interior angle of a polygon is also known as the angle measured at the interior of a polygon.

the number of sides of given polygon is 20.

we know that, sum of the measures of the interior angles can be found by using formula : (n-2) × 180

where n= no. of sides of given polygon

So, sum of the measures of the interior angles of 20 sided figure :

     = (n-2) × 180

     = (20-2) × 180

     = 18 × 180

     = 3240 .

To learn more about Interior angles, visit the link :

https://brainly.com/question/24966296

#SPJ1

Answer:

total

percentage

Step-by-step explanation:

total would be all percentage would be part

Answer:

80 hours

Step-by-step explanation:

let d represent doug, let l represent laura

first, set up a system of equations representing the problem:

since doug spent 10 less than twice the hours laura did, and we know that the total amount of hours they spent together is 230:

l=2d+10

d+l=230

then solve:

*first i rearranged the equations so i can solve this system of equations using elimination method*

l-2d=10

l+d=230

*subtract*

3d=240

d=80

so, doug spent 80 hours in the lab

Answer:

+61

Step-by-step explanation:

Answer:

61

Step-by-step explanation:

Please mark as brainliest!

Answer:

29/7     or     4  1/7

Step-by-step explanation:

Let x be the unknown number.

7 times a number is 7x,

and then 14 less than that would be 15.

7x-14=15

Now simplify by adding 14 and dividing by 7

7x=29

x=29/7    or 4 1/7

Answer:Just multiply Step-by-step explanation:do 12x10x20=2,400

For each t-shirt sold, which I'll call t, 8th grade makes $15.

For each hat sold, which I'll call h, 8th grades makes $5.

They want to raise $900

A: The equation to represent this situation is 15t+5h=900 because if 8th grade adds up all the profits from both hats and t-shirts, the goal is to make $900, so the total profit from shirts and hats should equal 900 dollars.

B: I'm just going to choose random numbers. Let's say nobody wanted to buy a hat from the 8th graders (h=0). You'd end up with

15t+5(0)=900

15t=900

t=60 - If they sold 0 hats they would have sold 60 shirts to raise $900

Now let's say it was the other way around - nobody wanted to buy t-shirts

15(0)=5h=900

5h=900

h=180 - If they sold 0 t-shirts they'd have to sell 180 hats to raise $900

Finally let's say they sold 30 t-shirts

15(30)+5h=900

450+5h=900

5h=450

h=90 - They'd have to sell 30 t-shirts and 90 hats to raise $900

Answer:

the coordinates of b if it is reflected over the x-axis (-2,5)

Answer:

Multiply by 1.16

Step-by-step explanation:

Answer:

Multiply it by 0.16

Answer:

E

Step-by-step explanation:

I have never heard of it in my entire life.

Answer and Step-by-step explanation:

A is the correct answer.

The shape called hexahectaenneacontakaiheptagon has 697 sides.

#teamtrees #PAW (Plant And Water)

Answer:

7/8

Step-by-step explanation:

U have to use the highest common factor and the lowest common denominator

Answer:

[tex] \frac{7}{8} = 0.875 [/tex]

Step-by-step explanation:

devide the numerator and denumerator by nine

Answer:

The area of the triangle is 84.511 square units.

Step-by-step explanation:

First step, we need to calculate lengths of line segments AB, BC and AC by Pythagorean Theorem:

AB:

[tex]AB = \sqrt{(12-0)^{2}+(3-8)^{2}}[/tex]

[tex]AB = 13[/tex]

BC:

[tex]BC = \sqrt{(7-12)^{2}+(-9-3)^{2}}[/tex]

[tex]BC = 13[/tex]

AC:

[tex]AC = \sqrt{(7-0)^{2}+(-9-8)^{2}}[/tex]

[tex]AC \approx 18.385[/tex]

Now, we can determine the area of the triangle ([tex]A[/tex]) by Heron's formula:

[tex]A = \sqrt{s\cdot (s-AB)\cdot (s-BC)\cdot (s-AC)}[/tex] (1)

[tex]s = \frac{AB+BC+AC}{2}[/tex] (2)

Where [tex]s[/tex] is the semiperimeter of the triangle.

If we know that [tex]AB = 13[/tex], [tex]BC = 13[/tex] and [tex]AC \approx 18.385[/tex], then the area of the triangle is:

[tex]s = 22.193[/tex]

[tex]A = 84.511[/tex]

The area of the triangle is 84.511 square units.

Answer:

,square root of 15;3;4;square root of 21 ;square root of 24 ;5;6;square root of 40

Step-by-step explanation:

the square roots ain't perfect square so make them decimals to know which one is bigger

Answer:

x=8 and y =40

Step-by-step explanation:

this is the answer

Answer:

200 stamps should be Kevin whole collection.

Step-by-step explanation:

What's the question exactly? I don't know, I just wrote something I think you might find useful.

Answer:

20 stamps..

You didn't give the whole question but I am GUESSING that it is what is his total amount of stamps in his entire album..

--

10 x 2 = 20

Answer:

Step-by-step explanation:

Last season two running backs on the Steelers football team rushed a combined total of 1550 yards.  One rushed 4 times as many yards as the other.  Let x and y represent the number of yards each individual player rushed. this is the equation that was used

         x + y = 1550

         y  = 4x

Answer:

I might be wrong but since ur in a rush: 173

Step-by-step explanation:

Answer:

287.25 miles in 5.75 hours

Step-by-step explanation:

so he was first driving at 48mph because 168/3.5=48

5 miles per hour faster than that is 53mph

53*2.25=119.25

then we add 119.25 and 168

Answer:

sorry i need this for a challenge :)

Step-by-step explanation:

Answer:

its blurry

Step-by-step explanation:

Answer:

Step-by-step explanation:

X is mass which I s decrease. If you have 740 grams of element x and you add the function.per the rate day you will have a hundredth percent.

Answer:

f(t)=740(0.9970)^365t

0.30% decrease per day

Answer: It’s C

Step-by-step explanation:

Answer:

o . ooo 2 and dr 45009.7 ok byy

Answer:

B

Step-by-step explanation:

Answer:

38

Step-by-step explanation:

sub everything

4(5)-3(2)(-3)=38

Answer:

y = -1/5x -8/5

Step-by-step explanation:

(-3,-1) and (2,-2)

m=(y2-y1)/(x2-x1)

m = ( -2 + 1)/(2 + 3)

m = (-1)/(5)

m = -1/5

y - y1 = m(x - x1)

y + 1 = -1/5(x + 3)

y + 1 = -1/5x -3/5

y = -1/5x -8/5

Answer:

120 units^2

Step-by-step explanation:

(12)(5)(0.5)(2) + (12)(2) + (13)(2) + (5)(2) = 120 units^2

Answer:

Step-by-step explanation:

Even I need help with that

Answer:

87.5

Edited: Yea should be 56, misread it LOL.

Appoligise to that silly mistake

Step-by-step explanation: