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Molodets [167]
3 years ago
13

Which equation demonstrates the additive identity property?

Mathematics
1 answer:
kramer3 years ago
6 0
It's the first one (7+4i)+(7-4i)=14
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Delvig [45]
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8 0
3 years ago
Permutations vs combinations(one step):
Bogdan [553]

Answer:

the expression is: ^{15}P_3=\frac{15!}{(15-3)!}

and 2730 different ways are possible.

Step-by-step explanation:

In the given question we have to choose a president, vice

president, and secretary.

Permutations are used when order is important so, as in the given question order is required. We would use permutations

The formula used is: ^nP_r=\frac{n!}{(n-r)!} where:

n=total number of objects

r=number of objects selected

In our case: n=15, r=3

Putting values and finding the answer:

^nP_r\\^{15}P_3=\frac{15!}{(15-3)!} =2730 \ ways

So, the expression is: ^{15}P_3=\frac{15!}{(15-3)!}

and 2730 different ways are possible.

7 0
3 years ago
A mathematics instructor wants to see if a computer homework system improves the scores of the students in the class. The instru
Vilka [71]

Answer:

No

Step-by-step explanation:

Two samples are matched pairs if the samples are dependent sample. All the attributes or characteristics of these samples are the same except the one thing which we need to study or experiment.

The given samples are independent samples. So, these these two sample are not matched pair samples. Such samples cannot be used to perform the paired sample t test. For this test the samples must always be dependent.

Example of dependent or matched pairs samples under given scenario would be like:

The instructor teaches a section in one semester using the computer homework system and in the next semester he teaches the same section using the paper and pencil homework system.

Usually the pairs in matched pairs are the same people just at different time, as stated in the previous example.

4 0
4 years ago
Word problem for 3(23)
Flauer [41]
This shows the multiplication between 3 and 23. So your word problem will have to show that. Jean buys three packs of gum. Each pack has 23 pieces. How many pieces of gum does Jean have in total? :)
7 0
4 years ago
If the reserve rate is 10% and a bank receives a deposit of $320,000, how much of the $320,000 is the bank free to loan out?
puteri [66]
Reserve
320,000×0.10
=32,000

Loan out
320,000−32,000
=288,000. ...answer
6 0
4 years ago
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