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3 years ago

Help me please and fast need it done by tonight

Mathematics

1 answer:

Xelga [282]3 years ago

4 0

Answer:

3 $\frac{1}{2}$

Step-by-step explanation:

Given

$\frac{\frac{1}{2} }{4}$ = $\frac{x}{28}$ ( cross- multiply )

4x = $\frac{1}{2}$ × 28 = 14 ( divide both sides by 4 )

x = $\frac{14}{4}$ = $\frac{7}{2}$ = 3 $\frac{1}{2}$

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1.) The commuter trains on the Red Line for the Regional Transit Authority (RTA) in Cleveland, OH, have a waiting time during pe

alisha [4.7K]

Answer:

a) For this case we define the random variable as X ="waiting time during peak hours" and we know that this distribution follows an uniform distribution:

$X \sim Unif(a=0,b=8)$

Where a and b represent the limits of the distribution.

b) $f(x) = \frac{1}{8}= 0.125, a\leq x \leq b$

And the height for this case would be 0.125

Step-by-step explanation:

Part a

For this case we define the random variable as X ="waiting time during peak hours" and we know that this distribution follows an uniform distribution:

$X \sim Unif(a=0,b=8)$

Where a and b represent the limits of the distribution.

Part b

For this case the density function would be given by:

$f(x) = \frac{1}{8}= 0.125, a\leq x \leq b$

And the height for this case would be 0.125

And $f(x)= 0$ for other case.

The cumulative distribution function would be given by:

$F(x) = 0, x$

$F(x) = \frac{x-a}{b-a}= \frac{x}{8}, 0\leq x < 8$

$F(x) = 1, x\geq 8$

3 0

3 years ago

Which is the inverse of the function f(x)=1/3x+5

jolli1 [7]

Answer:

f-¹(x) =(1-5x) /3x.

Step-by-step explanation:

f(x)=1/(3x+5)

Let y=1/(3x+5)

Exchanging x and y,

x=1/(3y+5)

3y+1=1/x

3y=1/x-5

3y=(1-5x) /x

y=(1-5x)/3x

f-¹(x) =(1-5x) /3x.

5 0

3 years ago

Read 2 more answers

while working out susie does 25 sit ups for every 12 push ups if she does 60 push ups how many sit ups will she do?

Lunna [17]

Answer:

125 sit ups

Step-by-step explanation:

well if you divide 60 by 12 you get five and if you multiply 25 and 5 you get 125

3 0

3 years ago

Read 2 more answers

Does anyone know this?

Vedmedyk [2.9K]

Answer:

x = 8°

Step-by-step explanation:

(7 x + 1) + (3 x +9) = 90

10 x + 10 = 90

10 x = 80

x = 8°

6 0

3 years ago

PLEASE HELP!!

erik [133]

$2.=c.\\\\2\sin4x\cos4x=2\sin(2\cdot4x)=2\sin8x\\\\Used:\\\sin2\alpha=2\sin\alpha\cos\alpha$

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$3.=a.\\\\\dfrac{\sin x-1}{\sin x+1}=\dfrac{\sin x-1}{\sin x+1}\cdot\dfrac{\sin x+1}{\sin x+1}=\dfrac{\sin^2x-1^2}{(\sin x+1)^2}=\dfrac{\sin^2x-1}{(\sin x+1)^2}\\\\=\dfrac{-(1-\sin^2x)}{(\sin x+1)^2}=\dfrac{-\cos^2x}{(\sin x+1)^2}\\\\Used:\\(a-b)(a+b)=a^2-b^2\\\\\sin^2x+\cos^2x=1\to \cos^2x=1-\sin^2x$

8 0

3 years ago