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3 years ago

If x=-5 what is the value of x^2-1/x+1? A. 6 b. -4 c. 4 d. 5 4/5 e. 19 need answers asap

Mathematics

1 answer:

xxTIMURxx [149]3 years ago

4 0

Answer:

The answer is -6 but its not in the option

Step-by-step explanation:

$\frac{ {x}^{2} - 1 }{ x + 1}$

Let x = -5

[(-5)²-1]/(-5+1)

= (25-1)/(-4)

= 24/-4

= -6

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abruzzese [7]

Answer:

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Step-by-step explanation:

Given that oil is pumped continuously from a well at a rate proportional to the amount of oil left in the well. Initially there were 3 million barrels of oil in the well; six years later 1,500,000 barrels remain.

i.e. if V stands for volume of oil, then

$V' =kV\\dv/V= kdt\\ln V = kt+C\\V = Ae^{kt}$

To find A and k

V(0) = A = 3 million

Hence V = $3e^{kt}$

V(6) = 1.5

i.e. $1.5 = 3e^{6k}\\ln 1.5 =ln 3 +6k\\k = -0.11552$

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a) Using the above value of k , we have

$V' = -0.11552 *V\\= -0.11552(1.8)\\ \\=-0.20794$ million per year.

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3 years ago

Type the correct answer in the box. x y 3 10 20 In the table, the relation (x, y) is not a function if the missing value of x is

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The relation is <em>not a function</em> if any x-value is repeated.

Assuming you have

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3 years ago

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If you paid $1600 in property taxes on a house appraised at $80,000 what is the property tax rate in your neighborhood?

bazaltina [42]

Answer: 2%

Step-by-step explanation:

1600/80000. Simplifying by 100:

16/800. Simplifying by 8, comes to:

2/100 = 2%

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3 years ago

Suppose it takes 4 hours for a certain strain of bacteria to reproduce by dividing in half. If 70 bacteria are present to begin

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Answer:

1 day: 4480

2 days: 8960

3 days: 13440

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Step-by-step explanation:

Given

$f(x) = 70 \cdot 64x$

Solving (a): The amount present after 1 day.

Here, $x =1$

So:

$f(1) = 70 \cdot 64*1= 4480$

Solving (b): The amount present after 2 days.

Here, $x =2$

So:

$f(2) = 70 \cdot 64*2= 8960$

Solving (c): The amount present after 3 days.

Here, $x = 3$

So:

$f(3) = 70 \cdot 64*2= 13440$

Solving (d): The inverse function of:

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Replace f(x) with y

$y= 4x^2 + 4$

Swap x and y

$x= 4y^2 + 4$

Rewrite as:

$4y^2 = x -4$

Divide by 4

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Take square roots

$y = \sqrt{\frac{x -4}{4}}$

Replace y with function inverse

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3 years ago

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Answer:

Step-by-step explanation:

Basic Charge = $ 65

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Number of hours = H

Rate for H hours = 28 *H = 28H

Equation:

65 + 28H ≤ 250

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