3 years ago

What is the answer it is way out of my level

Mathematics

1 answer:

pychu [463]3 years ago

7 0

Answer:

the answer should be B I got 11 and 1/4 and B is one digit off so I'm assuming that this is the answer

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PLZZZZZZ HELPPPPP! Question 8

tankabanditka [31]

X=2t
y=1-t
t=x/2
y=1-x/2
y=(-1/2)x+1

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3 years ago

Find an for the arithmetic series with s16 = -288 And a1 =-21

Maru [420]

If $d$ is the common difference between terms in the sequence $\{a_n\}$ , then

$a_1=-21$
$a_2=a_1+d=-21+d$
$a_3=a_2+d=-21+2d$
...
$a_n=a_{n-1}+d=\cdots=-21+(n-1)d$

You're told that $S_{16}=-288$ (the sum of the first 16 terms in the sequence, presumably). Well, we know that

$S_{16}=\displaystyle\sum_{n=1}^{16}a_n=\sum_{n=1}^{16}(-21+(n-1)d)$
$S_{16}=\displaystyle(-21-d)\sum_{n=1}^{16}1+d\sum_{n=1}^{16}n$

Recall that

$\displaystyle\sum_{n=1}^kn=\frac{k(k+1)}2$

so that we have

$-288=16(-21-d)+\dfrac{16(16+1)}2d\implies d=\dfrac25$

So we get

$\begin{cases}a_1=-21\\\\a_n=-21+\dfrac25(n-1)\end{cases}$

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3 years ago

HELP I DONT UNDERSTAND CAN SOMEONE HELP

Rashid [163]

B

Do 450 x 2/5 (0.4 in decimal form)

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2 years ago

19. The formula P = a + b + cgives the perimeter P of a triangle with side

vampirchik [111]

Answer:

33 + 56 + 65 = 154

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3 years ago

½x - 5 = -6 Which solution makes this equation true? 1. -12 2. -2

Ugo [173]

Answer: -2

Let’s try x = -12

1/2(-12) - 5 = -6

PEMDAS says to multiply first

1/2 x -12 = -6

So

-6 - 5 = -6

-6 - 5 = -11 not -6 so it’s not that

Now let’s do x = -2

1/2(-2) - 5 = -6

Again, you multiply first

1/2 x -2 = -1

-1 - 5 = -6 so it works

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3 years ago