3 years ago

The mean of 4 numbers is 21. calculate the sum of the 4 numbers

Mathematics

1 answer:

Ugo [173]3 years ago

8 0

Answer:

Step-by-step explanation:

The mean is calculated as

mean = $\frac{sum}{count}$ , then

$\frac{sum}{4}$ = 21 ( multiply both sides by 4 )

sum = 84

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Gnom [1K]

Answer:

The last term on the paper after 50 students = $2^{(50)} -1$

Step-by-step explanation:

The general term of the equation:

Here, the first term = 1

Second term = 2(1) + 1 = 3 = 4 - 1 = $2^{2} - 1$

Third Term = 2(a2) + 1 = 2(3) + 1 = 7 = 8 -1 = $2^{3} - 1$

Fourth term = 2( a3) + 1 = 2(7) + 1 = 15 = 16 - 1 = $2^{3} - 1$

Continuing this way, we get

Last term : $a_n = 2^n -1$

So, the 50th term of this sequence is

$a_{(50)} = 2^{(50)} -1$

Hence, the last term on the paper after 50th student changes it = $2^{(50)} -1$

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3 years ago

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SashulF [63]

Answer:

True

Step-by-step explanation:

You're claiming that every set is a subset of itself.

That's trivially true, because

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requires that every element of A is also an element of A, which is tautologically true.

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3 years ago

Solve for x.

solmaris [256]

Answer:

$x =-\frac{4}{5}$

Step-by-step explanation:

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Hope this helps!

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snow_tiger [21]

Answer:

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60 votes are required to change a village parking law. if 9/20 of the 100 people in a village vote to change the law, are there

aksik [14]

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3 years ago

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