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Serhud [2]
3 years ago
7

Last year, the school library had a total of x books. Over the summer, the library acquired another 31 books and now has a total

of 1,867 books. Which equation could be used to find x, the number of books the library had last year? A. x + 31 = 1,867 B. x - 31 = 1,867 C. 1,867 + x = 31 D. 31x = 1,867
Mathematics
1 answer:
tester [92]3 years ago
6 0

Answer:

A is your answer.

Step-by-step explanation:

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An animal shelter has a 58% adoption rate for puppies. Of all puppies in the shelter, 80% live to be 7 years or older. Of the pu
dexar [7]

Answer:

P(A∩B) = 0.522

Step-by-step explanation:

Let's call A the event that a puppy is adopted and B the probability that a puppy live 7 or more years

So, the probability P(A∩B) that a randomly selected puppy in the shelter will get adopted and live 7 or more years is:

P(A∩B) = P(A)*P(B/A)

Because A and B are not independents.

Then, the probability P(A) that a puppy is adopted is 58% and the probability P(B/A) that a puppy live 7 or more years given that the puppy is adopted is 90%.

Finally, replacing the values, we get:

P(A∩B) = 0.58*0.9 = 0.522

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7 0
3 years ago
The original rectangle has a perimeter of 16
zaharov [31]

As we can see that the sides of the rectangle have been doubled

6.2 ft changed to 12.4 ft

Now when the sides have been doubled

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So the perimeter of new rectangle should be the double the perimeter of old rectangle

So perimeter of new rectangle = 2 (16 ) = 32 feet

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7 0
3 years ago
What percent of the people chose turkey or ham as their favorite sandwich? A. 6% B. 50% C. 28% D. 62%
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B IS THE CORRECT ANSWER
BTWWW
7 0
3 years ago
A polyhedron has 8 vertices and 14 edges. How many faces must it have?
Scorpion4ik [409]
We know that

The Euler's formula state that, the number of vertices, minus the number of edges, plus the number of faces, is equal to two

V - E + F = 2
clear F
F=2-V+E

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E=14
F=?
so
F=2-8+14
F=8

the answer is
8 faces
7 0
3 years ago
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