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3 years ago

For each of the three ionic compounds, select which main group X belongs to. a.)X3PO4 b.)CaX2 c.)X2(SO4)3

1 answer:

4 0

A) First because it has a valency of +1

b) Seventh because it has a valency of -1

c) Third because it has a valency of +3

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If 5 shirts and 5 sweaters cost $205, and 6 shirts and 9 sweaters cost $294, what is the cost of one shirt and what is the

Pani-rosa [81]

Answer:

shirt is 20.5 and sweater is 16.33

Step-by-step explanation:

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3 years ago

Complete ?:44=2:11<br> (Please help me )

Aleks04 [339]

Answer:

? = 8

Step-by-step explanation:

well

x/44 = 2/11

44 is greater than 11 by 4 times. so to get an equal fraction you need to multiply 2 by 4 to get 8. that way you get 8/44 which would simplify by dividing by 4 to get 2/11

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3 years ago

What are the domain and range of the function f(x)=3x-1 /2

mel-nik [20]

Answer:

f(x)=3x−1

Step-by-step explanation:

The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined. The range is the set of all valid y values. The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined.

Interval Notation:

(-∞,∞)

Set-Builder Notation:

{x|x∈R}

The range is the set of all valid

values. Use the graph to find the range.

Interval Notation:

(−∞,∞)

Set-Builder Notation:

{y|y∈R}

Determine the domain and range.

Domain:

(−∞,∞),{x|∈R}

Range:

(−∞,∞),{y|y∈R}

8 0

3 years ago

Read the caption please

ladessa [460]

Answer:

Step-by-step explanation:

4 0

3 years ago

There are 25 pens in a container on your desk. Among them, 20 will write well but 5 have defective ink cartridges. You will sele

n200080 [17]

Answer:

3.33% probability that both pens are defective.

Step-by-step explanation:

The pens are chosen without replacement, so we use the hypergeometric distribution to solve this question.

Hypergeometric distribution:

The probability of x sucesses 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 sucesses.

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:

2 defective, so x = 2.

25 pens, so N = 25.

Two pens will be selected, so n = 2.

5 are defective, so k = 5.

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

$P(X = 2) = h(2,25,2,5) = \frac{C_{5,2}*C_{20,0}}{C_{25,2}} = 0.0333$

3.33% probability that both pens are defective.

5 0

3 years ago