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andrew11 [14]
3 years ago
7

Hellllllllllllllllllllllllp

Mathematics
2 answers:
Vitek1552 [10]3 years ago
3 0
Sorry for my bad handwriting a notebook lol

Sedaia [141]3 years ago
3 0

Answer:

9/25

Step-by-step explanation:

\frac{3}{5x} - \frac{2}{3} = 1

\frac{3}{5x} = 1 + \frac{2}{3}

by taking LCM,

\frac{3}{5x} = \frac{3}{3} + \frac{2}{3}

\frac{3}{5x} = \frac{3+2}{3}

\frac{3}{5x} = \frac{5}{3}

cross multiply

5x × 5 = 3 × 3

25x = 9

x = 9/25

hope this helps you!!

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In one region, the September energy consumption levels for single-family homes are found to be normally distributed with a mean
Otrada [13]

Answer:

a=1050 -0.126*218=1022.532

So the value of height that separates the bottom 45% of data from the top 55% is 1022.532.  

Step-by-step explanation:

1) Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

2) Solution to the problem

Let X the random variable that represent the consumption levels of a population, and for this case we know the distribution for X is given by:

X \sim N(1050,218)  

Where \mu=1050 kWh and \sigma=218kWh

For this part we want to find a value a, such that we satisfy this condition:

P(X>a)=0.55   (a)

P(X   (b)

Both conditions are equivalent on this case. We can use the z score again in order to find the value a.  

As we can see on the figure attached the z value that satisfy the condition with 0.45 of the area on the left and 0.55 of the area on the right it's z=-0.26. On this case P(Z<-0.126)=0.45 and P(z>-0.126)=0.55

If we use condition (b) from previous we have this:

P(X  

P(z

But we know which value of z satisfy the previous equation so then we can do this:

z=-0.126=\frac{a-1050}{218}

And if we solve for a we got

a=1050 -0.126*218=1022.532

So the value of height that separates the bottom 45% of data from the top 55% is 1022.532.  

8 0
3 years ago
John rides his bike with a constant speed of 20 km/h. How far can he travel in 2 1/2 hours?
Olegator [25]

Ok so,

20*2= 40

20*1/2=10

40+10=50

So Johncan travel 50 km in 2 1/2 hours.

Hope this helps :)

4 0
3 years ago
how do you write this in number form six million, four hundred fifty-two thousand, five hundred sixty-six
kiruha [24]

Answer:

6,452,566

Step-by-step explanation:

5 0
3 years ago
Answer this Q QUIQLY PLZ
MariettaO [177]

Answer: 3. HAVE AN AMAZING DAY

8 0
3 years ago
Plxxx help me i'm giving brainlyest
GenaCL600 [577]

Answer:

Words for dividing:

  • shared
  • each
  • for every
  • per

The problem is asking you to divide, because the key word is, "fill empty egg cartons that each hold"

So Mary will fill  each carton with 12 eggs each until she runs out.

216 / 12

<em>12 goes into 216 eighteen times exactly.</em>

<em />12 * 18 = 216

<em>and the result is(R means leftovers, which are none here)...</em>

<em />18~R~0

3 0
2 years ago
Read 2 more answers
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