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3 years ago

Numbers 3 and 4 are difficult

Mathematics

1 answer:

Tju [1.3M]3 years ago

5 0

3) Multiply the price of the item ($40) by the percent of the sales tax (8%). Then add that to the price of the item to get the total.

=$40 * 8%
=40 * 0.08
=$3.20 tax

=$40 price of item + $3.20 tax
=$43.20 total

5) Multiply the number of students in the band last year (36) by the percentage increased (125%).

=36 * 125%
=36 * 1.25
=45

Hope this helps! :)

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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

kherson [118]

Answer:

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

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

8 0

3 years ago

B2-4ac When: a=2 b=5 C=0

Vera_Pavlovna [14]

Answer: 10

Step-by-step explanation:

5*2-4*2*0

10-0

8 0

3 years ago

_+3=-9 pls help I will give branlyiest

lions [1.4K]

Answer:

-12

Step-by-step explanation:

? + 3 = -9

Subtract 3 from -9

-9 - 3 = -12

? = -12

7 0

3 years ago

Can someone help me please.

Novosadov [1.4K]

Answer:

1 is 6.45

Step-by-step explanation:

3.25+1.55+1.65=6.45

6 0

2 years ago

Find an equation for the perpendicular bisector of the line segment whose endpoints are

Andrew [12]

The equation of the perpendicular bisector is y = $-\frac{7}{2}$ x + 2

Step-by-step explanation:

Let us revise the relation between the slopes of perpendicular lines

The product of the slopes of two perpendicular lines is -1
That means if the slope of one of them is m, then the slope of the other is $-\frac{1}{m}$
You reciprocal the slope of one and change its sign to find the slope of the other