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3 years ago

F(x)=1\3x^2+3x-18 Please help with steps

Mathematics

2 answers:

ivanzaharov [21]3 years ago

6 0

So far, you've only defined f(x). You haven't asked a question.

Blababa [14]3 years ago

5 0

Okay, it looks like you're going to have to do this on your own (me too lol). I'm guessing you have to make a video also?

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30 POINTS PLS HELP!!!

Kisachek [45]

Answer:

C) 66

Step-by-step explanation:

We must follow PEMDAS which stands for:

P- Parenthenses

E- Exponents

M- Multiplication left to right

D- Division left to right

A- Addition left to right

S- Subtraction left to right

Parenthenses: 4^3+2(1)

Exponents: 64+2(1)

Multiplication: 64+2

Addition: 66

So the correct choice is C

8 0

4 years ago

Read 2 more answers

Draw a diagram and solve the problem below to see how far Cecil went on the tightrope.

lakkis [162]

It’s 19 thththtththt

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3 years ago

The sum of the first n terms of a geometric series is 364? The sum of their reciprocals 364/243. If the first term is 1, find n

Afina-wow [57]

If the geometric series has first term $a$ and common ratio $r$ , then its $N$ -th partial sum is

$\displaystyle S_N = \sum_{n=1}^N ar^{n-1} = a + ar + ar^2 + \cdots + ar^{N-1}$

Multiply both sides by $r$ , then subtract $rS_N$ from $S_N$ to eliminate all the middle terms and solve for $S_N$ :

$rS_N = ar + ar^2 + ar^3 + \cdots + ar^N$

$\implies (1 - r) S_N = a - ar^N$

$\implies S_N = \dfrac{a(1-r^N)}{1-r}$

The $N$ -th partial sum for the series of reciprocal terms (denoted by $S'_N$ ) can be computed similarly:

$\displaystyle S'_N = \sum_{n=1}^N \frac1{ar^{N-1}} = \frac1a + \frac1{ar} + \frac1{ar^2} + \cdots + \frac1{ar^{N-1}}$

$\dfrac{S'_N}r = \dfrac1{ar} + \dfrac1{ar^2} + \dfrac1{ar^3} + \cdots + \dfrac1{ar^N}$

$\implies \left(1 - \dfrac1r\right) S'_N = \dfrac1a - \dfrac1{ar^N}$

$\implies S'_N = \dfrac{1 - \frac1{r^N}}{a\left(1 - \frac1r\right)} = \dfrac{r^N - 1}{a(r^N - r^{N-1})} = \dfrac{1 - r^N}{a r^{N-1} (1 - r)}$

We're given that $a=1$ , and the sum of the first $n$ terms of the series is

$S_n = \dfrac{1-r^n}{1-r} = 364$

and the sum of their reciprocals is

$S'_n = \dfrac{1 - r^n}{r^{n-1}(1 - r)} = \dfrac{364}{243}$

By substitution,

$\dfrac{1 - r^n}{r^{n-1}(1-r)} = \dfrac{364}{r^{n-1}} = \dfrac{364}{243} \implies r^{n-1} = 243$

Manipulating the $S_n$ equation gives

$\dfrac{1 - r^n}{1-r} = 364 \implies r (364 - r^{n-1}) = 363$

so that substituting again yields

$r (364 - 243) = 363 \implies 121r = 363 \implies \boxed{r=3}$

and it follows that

$r^{n-1} = 243 \implies 3^{n-1} = 3^5 \implies n-1 = 5 \implies \boxed{n=6}$

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2 years ago

If 45 cookies will serve 15 students, how many cookies are needed for 30 students

valina [46]

90 cookies will feed 30 people just double 45

8 0

4 years ago

Read 2 more answers

Find the total surface area of this cupoid 6cm 2cm 5cm

enyata [817]

Answer: 60

Step-by-step explanation:

This is done by multiplying length x width x height (6x2x5)

4 0

3 years ago