All categories

3 years ago

X • x = 2x need help

Mathematics

2 answers:

I am Lyosha [343]3 years ago

8 0

$x*x=2x \\ x^2=2x \\ x^2-2x=0 \\ x(x-2)=0 \\ x = 0 \ \ \ \vee \ \ \ x-2=0 \ therefore \ x= 2$

marissa [1.9K]3 years ago

7 0

$x\cdot x=2x\\
x^2-2x=0\\
x(x-2)=0\\
x=0 \vee x=2
$

You might be interested in

a sporting goods store offers a 40% discount on all golf clubs. Rocco spent 20% of the money in his savings account on a golf pu

Inessa05 [86]

$189

If the discounted price is $210, and his friend gets a 10% discount on that price, you can divide 210/10 and get 21.

Rocco's friend gets a $21 discount on the $210 irons, so therefore he will be paying $189

4 0

4 years ago

Explain why 2x is a common factor of the three expressions below 4x2, 8xy and 6wx

lesya692 [45]

Answer:

2x is a common factor because it can be used to dive all three values without a remainder

Step-by-step explanation:

A factor is a number that can divide another number perfectly. That is without anything remaining.

We will now divide each of the expressions by 2x to show that 2 x is a factor of all three expressions

4x2 divided by 2x

In this, 2x will cancel out x2 to give 4 as the answer.

This shows 2x is a factor.

8xy divided by 2x

In this, x will divide x to give 1

2 will divide 8y to give 4y.

This shows 2x is a factor, since there was a perfect division throughout.

6wx divided by 2x

In this, x will divide x to give 1

2 will divide 6w to give 4y.

This shows 2x is a factor, since there was a perfect division throughout.

Therefore, 2x is a common factor of the three expressions below 4x2, 8xy and 6wx

4 0

3 years ago

Decreace £2500 by 1%

kondaur [170]

Ok, if you decrease £2500 by 1% you get 99% remaining
So
99% of £2500 = 0.99 x £2500 = £2475

6 0

3 years ago

Brianna received pledge amounts of $89, $35, $22, $36,

Alex17521 [72]

Answer:mean

Step-by-step explanation: I am also not sure because I been looking for the anwser to this but I think it’s mean

5 0

3 years ago

Wayne Gretsky scored a Poisson mean six number of points per game. sixty percent of these were goals and forty percent were assi

BartSMP [9]

Answer:

a) The mean for the total revenue he earns per game is of 13.2K while the standard deviation is of 3.63K.

b) 0.05 = 5% probability that he has four goals and two assists in one game

Step-by-step explanation:

In hockey, a point is counted for each goal or assist of the player.

In a Poisson distribution, the probability that X represents the number of successes of a random variable is given by the following formula:

$P(X = x) = \frac{e^{-\mu}*\mu^{x}}{(x)!}$

In which

x is the number of sucesses

e = 2.71828 is the Euler number

$\mu$ is the mean in the given interval. The standard deviation is the square root of the mean.

(a) Find the mean and standard deviation for the total revenue he earns per game.

60% of six are goals, which means that 60% of the time he earned 3K.

40% of six are goals, which means that 40% of the time he earned 1K.

The mean is:

$\mu = 6*0.6*3 + 6*0.4*1 = 13.2$

The standard deviation is:

$\sigma = \sqrt{\mu} = \sqrt{13.2} = 3.63$

The mean for the total revenue he earns per game is of 13.2K while the standard deviation is of 3.63K.

(b) What is the probability that he has four goals and two assists in one game

Goals and assists are independent of each other, which means that we find the probability P(A) of scoring four goals, the probability P(B) of getting two assists, and multiply them.

Probability of four goals:

60% of 6 are goals, which means that:

$\mu = 6*0.6 = 3.6$