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Daniel [21]
3 years ago
15

Which expression is a sum of cubes?

Mathematics
2 answers:
jeka57 [31]3 years ago
7 0

It's C, 27x^9+y6

hope this helps!

taurus [48]3 years ago
5 0

We have been given 4 expressions. We are asked to choose the expression that represents sum of cubes.

We know that sum of cubes is in form a^3+b^3.

We can see that 1st and 2nd option has a negative sign. Therefore, these options cannot be sum of cubes.

Let us check 3rd and 4th options one by one.

27x^9+y^6

We can rewrite our expression by writing terms as cubes:

3^3\cdot ( x^3)^3+(y^2)^3

( 3x^3)^3+(y^2)^3

Therefore, expression 27x^9+y^6 is a sum of cubes.

In 4th expression, we can see that 81=9^2=3^4. We cannot represent it as a cube. Similarly, we cannot represent y^{40} as a cube. Therefore, 4th expression is not correct.

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Many universities and colleges have instituted supplemental instruction (SI) programs, in which a student facilitator meets regu
aev [14]

Answer:

Step-by-step explanation:

Let many universities and colleges have conducted supplemental instruction(SI) programs. In that a student facilitator he meets the students group regularly who are enrolled in the course to promote discussion of course material and enhance subject mastery.

Here the students in a large statistics group are classified into two groups:

1). Control group: This group will not participate in SI and

2). Treatment group: This group will participate in SI.

a)Suppose they are samples from an existing population, Then it would be the population of students who are taking the course in question and who had supplemental instruction. And this would be same as the sample. Here we can guess that this is a conceptual population - The students who might take the class and get SI.

b)Some students might be more motivated, and they might spend the extra time in the SI sessions and do better. Here they have done better anyway because of their motivation. There is other possibility that some students have weak background and know it and take the exam, But still do not do as well as the others. Here we cannot separate out the effect of the SI from a lot of possibilities if you allow students to choose.

The random assignment guarantees ‘Unbiased’ results - good students and bad are just as likely to get the SI or control.

c)There wouldn't be any basis for comparison otherwise.

5 0
2 years ago
Find the volume of the cone.
Nesterboy [21]

V=πr2h

3=π·22·9

3≈37.69911

4 0
2 years ago
Read 2 more answers
On a workday the average decibel level of a busy street is 69 db, with 139 cars passing a given point every minute. if the numbe
Vlad1618 [11]
Decibel is directly proportional to number of cars passing the point. That is,

69 db ----- 139 cars
x   db ----- 17 cars

x = number of cars passing the point per minute on a weekend.

Then,
x= (69*17)/139 = 8.43 db ≈ 8 db
8 0
3 years ago
A student downloads 5 music files to a portable MP3 player. In how many different orders can the songs be played?
statuscvo [17]
<em>25 different ways </em>( the answer )

All you have to do is multiple the number by itself

or

<em>Example : </em>

6 backpacks and 3 pencils

6 times 3

18 different combinations :)
4 0
3 years ago
Simplify the complex expression (3+2i) + (-4+6i)
Pani-rosa [81]
(3 + 2i) + (-4 + 6i)

Get rid of the parenthesis.

3 + 2i - 4 + 6i

Note how we got rid of the (+) sign in +(-4). We do this because a negative times a positive is always going to be a negative.

Combine like terms.

(2i + 6i) + (3 - 4)

Simplify.

8i - 1

~Hope I helped!~
7 0
2 years ago
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