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3 years ago

I’ll give brainlist and all 5 stars!

Mathematics

2 answers:

malfutka [58]3 years ago

6 0

The answer is C, A, & C

blsea [12.9K]3 years ago

3 0

Answer:

Step-by-step explanation:

6) Slope = 5

(5 , 40) ; m =5

y - y1 = m(x -x1)

y - 40 = 5 (x - 5)

y -40 = 5x - 25

y = 5x - 25 + 40

y = 5x + 15

7) slope = 2

m =2 ; (-2 , 0)

y - y1 = m(x -x1)

y - 0 = 2(x -[-2])

y = 2(x +2)

y = 2x +4

8) D) It takes 6 miles to travel a mile

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3 years ago

Let A be a 3 by 6 , B be a 6 by 7 and C be a 7 by 3 matrix. Determine the size of the following matrices (if they do not exist,

kozerog [31]

Answer:

a. AB: 3 by 7

b. BA: N by N

c. A^TB: N by N

d. BC: 6 by 3

Step-by-step explanation:

Given

$A =3\ by\ 6$

$B =6\ by\ 7$

$C =7\ by\ 3$

Required

The dimension of the following matrices

As a general rule:

For A * B to be successful, the columns in a must equal the rows in B

Using this rule, we have:

$A_{m*n} * B_{n * p} = AB_{m*p}$

So:

$(a)\ AB$

$A_{3*6} * B_{6*7} \to AB_{3 * 7}$

$(b)\ BA$

$B_{6*7} * A_{3*6} \to AB_{N * N}$

The column numbers of B does not equal the row numbers of A.

Hence, BA does not exist

$(c)\ A^TB$

$A^T$ implies that:

If $A =3\ by\ 6$ , then

$A^T = 6\ by\ 3$

So:

$A^T_{6*3} * B_{6,7} \to A^TB_{N*N}$

The column numbers of A^T does not equal the row numbers of B.

Hence, $A^TB$ does not exist

$(d)\ BC$

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BaLLatris [955]

Answer:

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Step-by-step explanation:

hope this helps

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Answer:

Step-by-step explanation:

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