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3 years ago

Ernest wants to buy 21 new books for his book collection. If the average price for a

Mathematics

2 answers:

lukranit [14]3 years ago

3 0

Answer:

If each book cost $20.45 then you times it by 21 and the answer you would get is 429.45

Step-by-step explanation:

im 99% that its correct

klasskru [66]3 years ago

3 0

Answer:

He should expect to spend as much as 429.45 (to be exact)

Step-by-step explanation:

It's really just simple math $20.45 multiplied by 21 is 429.45 (:

I'm sorry if I'm wrong. Have a great day and good luck!

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What are the coordinates of A? b) What are the coordinates of B?

Georgia [21]

Answer:

A(-4.5 , 2) B(0 , -3.5)

Step-by-step explanation:

8 0

3 years ago

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

Solve for x. 3x² -10 = -5

timama [110]

Answer:

first one is the correct answer

8 0

3 years ago

Read 2 more answers

Yo factor x6 - 2x4 + x2 - 2. ( x2 + 2)( x4 - 1) x4 ( x2 - 2) ( x4 + 1)( x2 - 2)

Pepsi [2]

Answer:

(x4+1)(x2-2)

Step-by-step explanation:

x6-2x4+x2-2

separate them into two different expressions

(x6-2x4)+(x2-2)

factor out the common factor for each expression. For (x6-2x4), it would be x4, and for (x2-2), it would just be 1

x4(x2-2)+1(x2-2)

since there both expressions have the same factor, you can do a reverse of the distribution property and factor it like

(x4+1)(x2-2)

8 0

3 years ago

Compare and Contrast a square and an equilateral triangle? Be sure to communicate and discuss using mathematical language, ideas

ella [17]

The comparison and contrast between a square and an equilateral triangle are stated and explained below:

What is a square? A square is a plane shape with an equal length of sides. This implies that the measure of its length is the same as that of its breadth.

What is an equilateral triangle? A triangle is a plane shape with three sides, and a sum of its internal angles to equal $180^{o}$ . Thus an equilateral triangle is a type of triangle with equal lengths of sides, and therefore equal internal angles.

Comparison: i. The two shapes have equal lengths of sides.

ii. An equilateral triangle and a square are examples of plane shapes.

Contrast: i. An equilateral triangle has three sides, while a square has four sides.

ii. An equilateral triangle has three internal angles, while a square has four internal angles which are right angles.

iii. The sum of internal angles of an equilateral triangle is $180^{o}$ , while that of a square is $360^{o}$ .

For more clarifications on the properties of squares and triangles, visit:

brainly.com/question/12410856

#SPJ1

Kindly get 1-on-1 help from an expert tutor for more explanations if required.

6 0

2 years ago