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NikAS [45]
3 years ago
5

Supposed out of every 20 students are absent from school less than 5 days a year. Predict how many students would be absent from

school less than 5 days a year out of 40,000 students
Mathematics
1 answer:
Mademuasel [1]3 years ago
7 0
15,000 ????????????????
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Find the 7th term of the expansion of (3c + 2d)9.
SIZIF [17.4K]
\bf (3c+2d)^9\\\\
-------------------------------\\\\

\begin{array}{crcll}
term&&value\\
-----&&-----\\
1&&(3c)^9(2d)^0\\
2&+9&9(3c)^8(2d)^1\\
3&+36&(3c)^7(2d)^2\\
4&+84&(3c)^6(2d)^3\\
5&+126&(3c)^5(2d)^4\\
6&+126&(3c)^4(2d)^5\\
7&+84&(3c)^3(2d)^6\\
\end{array}

now.. if you notice, the exponent for the 1st term, is dropping on each term subsequently, start with highest, 9 in this case, and drops drops drops, till on the last term, will be 0

the exponent for the second term, starts off at 0, and goes up up and up on each term

that part is simple... now, the coefficient for them

the first one will have a coefficient of 1, so we can take a closer look at the 2nd instead

the coefficient for the second is 1* 9/ 1
(1) the coefficient of the current term, (9) the exponent of the 1st term, and (1) the exponent of the 2nd term on the next term

for example, how did we get 84 for the 4th term?   (36 * 7) / 3 = 84

and so on for all subsequent terms
8 0
3 years ago
What is EQUATION of<br> the line below?
julia-pushkina [17]
3, -1 !!!!!!!!!!!!!!
5 0
2 years ago
Find the reciprocal
Sav [38]

Answer:

Depends on what number(s)/fraction(s) your working with.

Step-by-step explanation:

Find the reciprocal of a fraction by flipping it. The definition of "reciprocal" is simple. To find the reciprocal of any number, just calculate "1 ÷ (that number)." For a fraction, the reciprocal is just a different fraction, with the numbers "flipped" upside down (inverted).

3 0
3 years ago
I cut a long piece of wood into 50cm pieces. I manage to cut
ehidna [41]

Answer:

WoodLength = 50w + 20

Step-by-step explanation:

Given

Length of Pieces = 50cm

Number of Pieces = w

Left over = 20cm

Required

Determine the length of the wood

Start by multiplying the number of pieces by the length of each pieces

Result = Length * Number

Result = 50 * w

Result = 50 w

Lastly, add the leftover to get the actual length of the wood

Wood Length = Result + Leftover

Substitute 50w for Result and 20 for Leftover

WoodLength = 50w + 20

<em>Hence, the length of the wood is 50w + 20</em>

5 0
3 years ago
Solve the system of equations by substituion,<br> -5x + y = 3<br> 7.5x - 1.5y = 3
Naya [18.7K]
The first equation, make the y as the subject. y = 3 + 5x, then substitute y in the second equation and you will get the value of x. then, substitute the x in the first equation (y = 3 + 5x)
5 0
3 years ago
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