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stealth61 [152]
2 years ago
6

Speed, Time, and Di 1 a. An airplane flies with a constant speed of 640 miles per hour. How far can it travel in 2 1/2 hours​

Mathematics
1 answer:
Ganezh [65]2 years ago
5 0

Answer:

Step-by-step explanation:

2½ hours × 640 miles/hour = 2½×640 miles = 1,600 miles

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Round to the tenths place .712 .665 .545
Artyom0805 [142]

.712 rounds to .7

.665  rounds to .7

.545 rounds to .5

5 0
3 years ago
Is matrix multiplication comutative?
konstantin123 [22]

Answer:

Matrix multiplication is not conmutative

Step-by-step explanation:

The matrix multiplication can be performed if the number of columns of the first matrix is equal to the number of rows of the second matrix

Let A with dimension mxn and B with dimension nxp represent two matrix

The multiplication of A by B is a matrix C with dimension mxp, but the multiplication of B by A is can't be calculated because the number of columns of B is not the number of rows of A. Therefore, you can notice that is not conmutative in general.

But even if the multiplication of AB and BA is defined (For example if A and B are squared matrix of 2x2) the multiplication is not necessary conmutative.

The matrix multiplication result is a matrix which entries are given by dot product of the corresponding row of the first matrix and the corresponding column of the second matrix:

A=\left[\begin{array}{ccc}a11&a12\\a21&a22\end{array}\right]\\B= \left[\begin{array}{ccc}b11&b12\\b21&b22\end{array}\right]\\AB = \left[\begin{array}{ccc}a11b11+a12b21&a11b12+a12b22\\a21b11+a22b21&a21b12+a22b22\end{array}\right]\\\\BA=\left[\begin{array}{ccc}b11a11+b12a21&b11a12+b12a22\\b21a11+b22ba21&b21a12+b22a22\end{array}\right]

Notice that in general, the result is not the same. It could be the same for very specific values of the elements of each matrix.

6 0
3 years ago
Solve for the value of z
zloy xaker [14]

Answer:

  26

Step-by-step explanation:

The two angles shown are a linear pair. Their sum is 180°.

  (4z -8)° +(3z +6)° = 180°

  7z = 182 . . . . . . . . . divide by °, add 2

  z = 26 . . . . . . . . . . divide by 7

3 0
3 years ago
Read 2 more answers
I know this problem is not too complicated but i wasnt sure if i was right
Grace [21]
Hi there!

So -5 1/2 + 7 3/4 is 
Improper fraction: 9/4
Decimal: 2.25
Mixed Number: 2 1/4
8 0
3 years ago
Read 2 more answers
What value of x is in the solution set of –5x – 15 > 10 + 20x?
Shalnov [3]

HI Brainiac


-5x-15 > 10+20x

-5x-20x > 10+15

-25x > 25

Divide both sides by -25

-25x/-25 > 25/-25

x < -1

Answer : B


I hope that's help:)

Have a great night :)


7 0
3 years ago
Read 2 more answers
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