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2 years ago

10

F(x) = 3x + 1 and f-1 = f-1 = x-1 / 3 then f -'(7) =

1 answer:

Nutka1998 [239]2 years ago

7 0

Answer:

2

Step-by-step explanation:

f^-1 (7) = $\frac{x-1}{3}$ = $\frac{7-1}{3}$ = $\frac{6}{3}$ = 2

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HURRYYYYYYYYY!! What is the equation of the quadratic function with a vertex at (2, 25) and an x-intercept at (7,0)?

tangare [24]

Answer:

$y=-(x-7)(x+3)$

which is none of the choices provided.

Are you sure the question is right or even the choices?

You can even write it as:

$y=-(x+3)(x-7)$ but this is still not a choice.

Step-by-step explanation:

The vertex form of a quadratic is $y=a(x-h)^2+k$ .

This is called vertex form because it gives you the vertex is $(h,k)$ .

We are given that $(h,k)=(2,25)$ which makes our equation:

$y=a(x-2)^2+25$ .

We can find the value of $a$ by plugging in the x-intercept (7,0) for $(x,y)$ into:

$y=a(x-2)^2+25$

$0=a(7-2)^2+25$

$0=a(5)^2+25$

Subtract 25 on both sides:

$-25=a(5)^2$

$-25=a(25)$

Divide both sides by 25:

$\frac{-25}{25}=a$

$-1=a$ .

So the equation for the quadratic is:

$y=-1(x-2)^2+25$

Let's put this into factored form since all the choices are in factored form.

This will require us to multiply the (x-2)(x-2) out:

$y=-1(x-2)(x-2)+25$

$y=-1(x^2-2x-2x+4)+25$

$y=-1(x^2-4x+4)+25$

$y=-x^2+4x-4+25$

$y=-x^2+4x+21$

Factor out -1:

$y=-(x^2-4x-21)$

WE need to find two numbers that multiply to be -21 and add to be -4:

$y=-(x-7)(x+3)$

8 0

3 years ago

Read 2 more answers

There are 7 cows and 5 chicken in the farmer's filed

Vanyuwa [196]

Answer:

7:12

Step-by-step explanation:

Total no of animals in the field = 7 + 5 = 12

Ratio of cows 2 all d animals in the field =

$\frac{no \: of \: cows}{total \: no \: of \: animals \: on \: the \: field}$

Ratio = 7/12 = 7:12

8 0

3 years ago

Use three fours to make 11.

mr Goodwill [35]

4 + 4 + 4 - 1 = 11? Was it supposed to be an equation? I am confused.

7 0

3 years ago

there are 1,560 students at a school. 85% of them ride the bus, how many students do not ride the bus?

Alja [10]

Answer:i think its 183

Step-by-step explanation

1560 devided by 85= 18.3 but just take away the decimal

3 0

3 years ago

Read 2 more answers

If there are a total of 25 questions, and I scored 56% on my test, how many answers did I get right, and how many answers did I

Ipatiy [6.2K]

Answer:

14 correct and 11 wrong

Step-by-step explanation:

If you got a 56% , we need to change this to decimal form 56% = .56

This is the percent you got right

.56* 25 = 14

You got 14 questions right

To determine the number of questions you got wrong, take the total number of questions minus the number you got right.

25-14 =11

You got 11 wrong

8 0

3 years ago