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3 years ago

9

What is the answer to 7(4p+2p+3r) help me pls =(

1 answer:

Alex Ar [27]3 years ago

8 0

Answer:

42p + 21r

Step-by-step explanation:

First look at the parentheses. Since 4p and 2p are the same variables, you can add them.

7(6p + 3r)

now you use the distributive property.

7 x 6p + 7 x 3r

42p + 21r

and then you get you’re answer.

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In Store A, you can buy 3 notebooks

PolarNik [594]

Answer:

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Step-by-step explanation:

3x + 2= 4x

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Determine formula of the nth term 2, 6, 12 20 30,42

nalin [4]

Check the forward differences of the sequence.

If $\{a_n\} = \{2,6,12,20,30,42,\ldots\}$ , then let $\{b_n\}$ be the sequence of first-order differences of $\{a_n\}$ . That is, for n ≥ 1,

$b_n = a_{n+1} - a_n$

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and we can solve for $b_n$ in terms of $b_1=4$ :

$b_{n+1} = b_n + 2$

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$b_{n+1} = (b_{n-2}+2) + 2\times2 = b_{n-2} + 3\times2$

and so on down to

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We solve for $a_n$ in the same way.

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Then

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$a_{n+1} = (a_{n-2} + 2(n-1)) + 2((n+1)+n) \\ ~~~~~~~ = a_{n-2} + 2 ((n+1) + n + (n-1))$

$a_{n+1} = (a_{n-3} + 2(n-2)) + 2((n+1)+n+(n-1)) \\ ~~~~~~~= a_{n-3} + 2 ((n+1) + n + (n-1) + (n-2))$

and so on down to

$a_{n+1} = a_1 + 2 \displaystyle \sum_{k=2}^{n+1} k = 2 + 2 \times \frac{n(n+3)}2$

$\implies a_{n+1} = n^2 + 3n + 2 \implies \boxed{a_n = n^2 + n}$

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2 years ago

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RUDIKE [14]

It would be 22/125.

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Answer:

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