3 years ago

If you're feeling generous today thank you!

Mathematics

1 answer:

Rasek [7]3 years ago

8 0

Answer:

n= -11/4 or n= -2 3/4

Step-by-step explanation:

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Will give 25 points and brainliest answer if correct

Norma-Jean [14]

Let $d$ be the common difference between terms in the sequence $\{a_n\}_{n\ge1}$ . Then

$a_{19}=-58$
$a_{20}=a_{19}+d$
$a_{21}=a_{19}+2d$
$\implies-164=-58+2d\implies d=-53$

The first term in the sequence, $a_1$ , satisfies

$a_2=a_1+d$
$a_3=a_1+2d$
$a_4=a_1+3d$
...
$a_{19}=a_1+18d$
$\implies-58=a_1+18(-53)\implies a_1=896$

So the explicit formula for the $n$ -th term in the sequence is

$a_n=a_1+(n-1)d\implies a_n=896-53(n-1)$

5 0

3 years ago

K/2+1/2=3 find the k

NikAS [45]

Answer:

k = 5

Step-by-step explanation:

Given

$\frac{k}{2}$ + $\frac{1}{2}$ = 3 ( multiply through by 3 to clear the fractions )