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riadik2000 [5.3K]
3 years ago
10

There are 10 books on a shelf, of which 4 are paperbacks and 6 are hardbacks. How many possible selections of 5 books from the s

helf contain at least one paperback and at least one hardback? A75 b120 c210 d246 e252
Mathematics
1 answer:
FinnZ [79.3K]3 years ago
7 0

The answer is d (246)


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Verify the property: a x ( b + c ) = a x b + a x c by taking a = −5<br> /2,b= 11/8​
soldi70 [24.7K]

Answer:

True

Step-by-step explanation:

a x ( b + c ) = a x b + a x c  Substitute

-5 x ( 11/8 + c ) = -5 x 11/8 + -5 x c

-5 ( c + 11/8) = - 5c - 55/8

- 5c - 55/8 = - 5c - 55/8

True

4 0
3 years ago
What is the value of 7 and 506,087
ozzi
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7 0
3 years ago
5/10 = n/40 HELP, WILL GIVE BRAINLIST IF PERFECT ANSWER
kondor19780726 [428]

Answer:

n=20

Step-by-step explanation:

5/10 equals 1/2 when simplified since 5÷5=1 and 10÷5=2

Half of 40 equals 40÷2 = 20 so n=20

Another way to do it is

Since the denominator is multiplied by 4 to get to 40

We must multiply 5 by 4 to get the numerator:

5×4=20

So n=20

3 0
2 years ago
Please hurry and i will mark you brainiest
Mrac [35]
I believe is A, the first one
8 0
3 years ago
Read 2 more answers
Please help with this
marta [7]

9514 1404 393

Answer:

  see attached

Step-by-step explanation:

13. The difference of two matrices is the term-by-term difference. For example, the bottom right term is the difference of the bottom right terms ...

  (-6) -(5) = -11

__

14. The scalar multiple of a matrix is the scalar multiplied by each term of the matrix. For example, the upper right term is ...

  3(1) = 3

__

15. The matrix product is the dot product of the rows of the left matrix with the columns of the right matrix. For example, the product term in row two, column one is the dot product of row 2 of C and column 1 of B:

  [9, -2, 4]·[-2, -7, 10] = 9(-2) +(-2)(-7) +4(10) = -18 +14 +40 = 36

_____

It is convenient to let an appropriate tool help with this. Many graphing calculators and spreadsheets are able to do these functions easily.

7 0
2 years ago
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