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3 years ago

Find all solutions to 4x^2 + 2x -2 = 1?

Mathematics

2 answers:

lakkis [162]3 years ago

8 0

Answer:

The answer is B

Step-by-step explanation:

Move the constant to the left, 4x^2+2x-2-1=0

Calculate the difference, 4x^2+2x-3=0

then solve using quadratic equation (must too difficult to type out)

Furkat [3]3 years ago

5 0

Answer:

=−1±1 3√4

Step-by-step explanation:

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The other zero is irrational.

Tom [10]

I think that 0 is rational, as it always is. The answer is D. I am not sure, but I hope it helps.

5 0

4 years ago

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Please look at the image.

dlinn [17]

Answer: C or 6/5

Step-by-step explanation: the question is 4/5 plus 2/5 so 6/5

3 0

4 years ago

According to insurance records, a car with a certain protection system will be recovered 87% of the time. If 600 stolen cars are

White raven [17]

Answer:

The mean and standard deviation of the number of cars recovered after being stolen is 522 and 8.24 respectively.

Step-by-step explanation:

We are given that according to insurance records, a car with a certain protection system will be recovered 87% of the time.

Also, 600 stolen cars are randomly selected.

Let X = <u><em>Number of cars recovered after being stolen</em></u>

The above situation can be represented through binomial distribution;

$P(X=r)=\binom{n}{r}\times p^{r} \times (1-p)^{n-r} ;x=01,2,3,......$

where, n = number of trials = 600 cars

r = number of success

p = probability of success which in our question is the probability

that car with a certain protection system will be recovered,

i.e. p = 87%.

So, X ~ Binom(n = 600, p = 0.87)

Now, the mean of X, E(X) = $n \times p$

= $600 \times 0.87$ = 522

Also, the standard deviation of X, S.D.(X) = $\sqrt{n \times p \times (1-p)}$

= $\sqrt{600 \times 0.87 \times (1-0.87)}$

= 8.24

3 0

3 years ago

What does X equal to

WITCHER [35]

X= 60
The triangle it is in is equilateral (as shown by the lines through the lines) and equilateral triangles have angles of 60.

Hope this helps :)

6 0

4 years ago

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Is (1,3) a solution of the graphed inequality, y=5/2x-3?

Viefleur [7K]

Answer:

Yes

Step-by-step Explanation:

The image below shows proof that the point (1,3) is part of the inequality y>5/2x-3

Hope this helps! :)

4 0

3 years ago