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3 years ago

I need help please ..

Mathematics

1 answer:

koban [17]3 years ago

4 0

A is 18

B is 162

C is 18

D is 162

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The sum of two numbers is 72 and their difference is 40. Using elimination method

d1i1m1o1n [39]

Answer:

here's what we know:

a + b = 72

a - b = 26

We can use the elimination method to solve this problem:

a + b = 72

a - b = 26

---------------

2a = 98

Divide both sides by 2:

a = 49

So we now have:

49 + b = 72

and:

49 - b = 26

Subtract 49 from both sides:

b = 23

and

-b = -23 (multiply both sides by -1) → b = 23

Step-by-step explanation:

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3 years ago

Laura found 12 shells on a trip to the beach. these seashells represent 1/4 of the shells in her whole collection. how many shel

Andru [333]

12x4=48-seashells Laura has in her collection

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3 years ago

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An English teacher needs to pick 1111 books to put on his reading list for the next school year. He has narrowed down his choice

forsale [732]

Answer:

There are 3,659,040 ways he can choose the books to put on the list.

Step-by-step explanation:

There are

12 novels

8 plays

12 nonfiction.

He wants to include

5 novels

4 plays

2 nonfiction

The order in which the novels, plays and nonfictions are chosen is not important. So we use the combinations formula to solve this problem.

$C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

How many ways can he choose the books to put on the list?

Novels:

5 from a set of 12. So

$C_{12,5} = \frac{12!}{5!7!} = 792$

Plays:

4 from a set of 8. So

$C_{8,4} = \frac{8!}{4!4!} = 70$

Nonfiction:

2 from a set of 12

$C_{12,2} = \frac{12!}{2!10!} = 66$

Total:

Multiplication of novels, plays and nonfiction.

$T = 792*70*66 = 3,659,040$

There are 3,659,040 ways he can choose the books to put on the list.

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3 years ago

Yo i need serious help please i’ll give u a brainliest if u get the correct answer

SCORPION-xisa [38]

Answer:

B. 5.22×10⁸

Step-by-step explanation:

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3 years ago

Find csc(angle) if tan(angle) = -4/3 and sin(angle) is positive.

Lerok [7]

Answer:

hm?

Step-by-step explanation:

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