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3 years ago

A bag contains 1 blue, 2 green, and 3 red marbles, as shown.

Mathematics

2 answers:

sleet_krkn [62]3 years ago

3 0

Answer:

One-third

Step-by-step explanation:

The reason is because there are 3 red marbles with a total of 9. That then becomes 3/9. If you simplify that it turns into 1/3.

Can i Please have brainliest!?

ValentinkaMS [17]3 years ago

3 0

Answer:

1/3

Step-by-step explanation:

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Select whether the equation has a solution or not.

vredina [299]

Answer: The equation has a solution .

Step-by-step explanation:

Since we have given that

$\sqrt{x+1}=7-2\sqrt{x}$

Squaring on both the sides, we get that,

$x+1=(7-2\sqrt{x})^2\\\\x+1=49+4x-28\sqrt{x}\\\\3x+48-28\sqrt{x}=0$

Let $\sqrt{x}=y\implies x=y^2$

So, our equation becomes,

$3y^2-28y+48=0\\\\y=\dfrac{14}{3}\pm \dfrac{2\sqrt{13}}{3}\\\\\sqrt{x}=\dfrac{14}{3}\pm \dfrac{2\sqrt{13}}{3}\\\\x=(\dfrac{14}{3}\pm \dfrac{2\sqrt{13}}{3})^2$

So, $x=\dfrac{248}{9}\pm \dfrac{56\sqrt{13}}{9}$

Hence, the equation has a solution .

4 0

3 years ago

What is the first step needed to solve (3/4)x-3=-18 ?

inn [45]

First step is Add 3 to both sides
hope it helps

3 0

3 years ago

A set of test scores is normally distributed with a mean of 130 and a standard deviation of 30 What score is necessary to reach

nlexa [21]

Answer:

A score of 150.25 is necessary to reach the 75th percentile.

Step-by-step explanation:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

A set of test scores is normally distributed with a mean of 130 and a standard deviation of 30.

This means that $\mu = 130, \sigma = 30$

What score is necessary to reach the 75th percentile?

This is X when Z has a pvalue of 0.75, so X when Z = 0.675.

$Z = \frac{X - \mu}{\sigma}$

$0.675 = \frac{X - 130}{30}$

$X - 130 = 0.675*30$

$X = 150.25$

A score of 150.25 is necessary to reach the 75th percentile.

7 0

3 years ago

For the right triangle shown, the lengths of two sides are given. Find the third side. Leave your answers in simplified, radical

PtichkaEL [24]

This is a simple Pythagorean theorem, which says that c2 = a2 + b2
So let us just apply it here:

c^2 = 4^2 + 4^2
c^2 = 16 + 16
c^2 = 32
c = √32
c = √2*16
c = 4√2

The correct answer is c = 4√2.

8 0

3 years ago

Read 2 more answers

4. 1 less than twice the square of a number

givi [52]

Answer:

2(x^2)-1

Step-by-step explanation:

The square of a number is just the number squared. We don't know what the number is so I will just say it is x. So we have 2 times x^2. Then we have to minus 1 from that. So 2(x^2)-1.

Hope this helps! :D

5 0

3 years ago