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3 years ago

56=13+d what does the d stand for I've been getting different answers trying to solve it

Mathematics

2 answers:

ElenaW [278]3 years ago

4 0

Answer:

Step-by-step explanation:

56-13=43............

Mamont248 [21]3 years ago

4 0

Answer:

d = 43

Step-by-step explanation:

56 = 13 + d Subtract 13 from 13 and subtract 13 from 56.

43 = d

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Answer:

28. m<A=20°, m<B=70°

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Step-by-step explanation:

complementary angle=a+b=90°

supplementary angle=a+b=180°

28. A+B=90°

5x+17x+2=90°

22x+2=90°

22x=90-2

22x=88

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Step-by-step explanation:

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Inside the box of every cereal box contains a surprise gift. The store manager assures employees that 22 of the 45 boxes on the

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Answer:

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Step-by-step explanation:

The cereals are chosen without replacement, which means that the hypergeometric distribution is used to solve this question.

Hypergeometric distribution:

The probability of x successes is given by the following formula:

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}*C_{N-k,n-x}}{C_{N,n}}$

In which:

x is the number of successes.

N is the size of the population.

n is the size of the sample.

k is the total number of desired outcomes.

Combinations formula:

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

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

In this question:

45 boxes, which means that $N = 45$

22 have the secret decoder ring, which means that $k = 22$

Two boxes, which means that $n = 2$

What is the probability that both of them have the secret decoder ring?

This is P(X = 2). So

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}*C_{N-k,n-x}}{C_{N,n}}$

$P(X = 2) = h(2,45,2,22) = \frac{C_{22,2}*C_{23,0}}{C_{45,2}} = 0.2333$

0.2333 = 23.33% probability that both of them have the secret decoder ring

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