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3 years ago

Plz help!! math test. pick abc or d. not sure if C is right?? pls help !

Mathematics

1 answer:

aleksley [76]3 years ago

6 0

Answer:

C is correct if I'm doing the math right. best of luck!!

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Solve 2x^3+7x^2-2x-1=o

Mashcka [7]

Answer:

$x=\sqrt{3}-2\\x=-\sqrt{3}-2\\x=\frac{1}{2}$

Step-by-step explanation:

This is a hard one

We have to use the rational root theorem

$2x^3+7x^2-2x-1$ = 0

We have to find all the factors of a and d and put them in a fraction

$a=2\\d=-1\\\frac{1}{1,2}$

We then plug them into the equation to see if any of them work

The equation isn't true when plugging 1, but is true when plugging in 1/2

factored form of 1/2 is (2x-1)

Then we divide the original equation by (2x-1) (you can use synthetic division or long division, it would be hard to type out the process for that) to get $x^2+4x+1$

So now the equation is $(2x-1)(x^2+4x+1)$

Solve the second half of this equation using the quadratic formula to get

$\sqrt{3}-2$ and $-\sqrt{3}-2$

We already know the solution for the first half of the equation (1/2)

So the final answers are:

$x=\sqrt{3}-2, -\sqrt{3}-2, \frac{1}{2}$

8 0

3 years ago

2 / 5 + ? / 15 = 16 / 15

maksim [4K]

Answer:

Step-by-step explanation:

I dont know the answer hope this helps

8 0

3 years ago

................ help ?

liq [111]

Answer:

quadratic

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

miskamm [114]

Answer:

4 lb

Step-by-step explanation:

Subtracting 4 lb from 18 lb yields 14 lb, the weight of the backpack without math book: 18 lb - 4 lb = 14 lb

The math book weighs 4 lb.

7 0

3 years ago

In Grafton, a rural area in Vermont, the distance (in meters) between telephone poles has a uniform distribution between 39 and

DerKrebs [107]

Answer:

46.43% probability that the distance is environment friendly.

Step-by-step explanation:

An uniform probability is a case of probability in which each outcome is equally as likely.

For this situation, we have a lower limit of the distribution that we call a and an upper limit that we call b.

The probability that we find a value X greater than x is given by the following formula.

$P(X > x) = \frac{b - x}{b-a}$

Uniform distribution between 39 and 67 meters:

This means that $a = 39, b = 67$

Any distance between poles greater than 54 meters is considered to be environment friendly. What is the probability that the distance is environment friendly?

$P(X > x) = \frac{b - x}{b-a}$

$P(X > 54) = \frac{67 - 54}{67 - 39}$

$P(X > 54) = 0.4643$

46.43% probability that the distance is environment friendly.

4 0

3 years ago