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Lesechka [4]
1 year ago
7

Find the midpoint M of the line segment joining the points C=(8,7) and D= (4,-5)

Mathematics
1 answer:
Anon25 [30]1 year ago
5 0

Explanation

We are told to find the midpoint of the line segment. To do so, we will use the formula:

midpoint=\frac{x_2+x_1}{2},\frac{y_2+y_1}{2}

In our case

\begin{gathered} x_1=8,y_1=7 \\ x_2=4,y_2=-5 \end{gathered}

Substituting the values above

\begin{gathered} Midpoint=\frac{8+4}{2},\frac{7-5}{2} \\  \\ Midpoint=\frac{12}{2},\frac{2}{2} \\  \\ Midpoint=(6,1) \end{gathered}

Thus, the midpoint is (6,1)

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Scores on a college entrance examination are normally distributed with a mean of 500 and a standard deviation of 100. What perce
Alla [95]

Answer:

The percentage is P(350 <  X  650 ) = 86.6\%

Step-by-step explanation:

From the question we are told that

   The population mean is  \mu  =  500

     The standard deviation is  \sigma  =  100

The  percent of people who write this exam obtain scores between 350 and 650    

    P(350 <  X  650 ) =  P(\frac{ 350 -  500}{ 100}

Generally  

               \frac{X -  \mu }{\sigma }  =  Z (The \  standardized \  value \ of  \  X )

   P(350 <  X  650 ) =  P(\frac{ 350 -  500}{ 100}

   P(350 <  X  650 ) =  P(-1.5

   P(350 <  X  650 ) =  P(Z < 1.5) -  P(Z <  -1.5)

From the z-table  P(Z <  -1.5 )  =  0.066807

   and P(Z < 1.5  ) =  0.93319

=>    P(350 <  X  650 ) =  0.93319 -  0.066807

=>  P(350 <  X  650 ) = 0.866

Therefore the percentage is  P(350 <  X  650 ) = 86.6\%

3 0
3 years ago
Simplify the expression 256b − b by combining like terms.
iris [78.8K]

Answer:

255b

Step-by-step explanation:

subtract 256b by b

7 0
3 years ago
Use the prism to answer the question. S in 2 in What is the surface area of the prism? O A 136 in2 B 192 in2 C 240 in2 D272 in2​
Vanyuwa [196]
Is there supposed to be a picture?? I see nothing im sorry. But i can help u cause this is just surface area, quite easy.
I will just give you the formula for surface area of a RECTANGULAR prism:
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Have a nice day
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Answer:

The period of the sine curve is the length of one cycle of the curve. The natural period of the sine curve is 2π. So, a coefficient of b=1 is equivalent to a period of 2π. To get the period of the sine curve for any coefficient b, just divide 2π by the coefficient b to get the new period of the curve.

Step-by-step explanation:

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