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Fittoniya [83]
3 years ago
8

Find the length of a rectangular lot with a perimeter of 50 feet if the length is five feet more than the width.

Mathematics
2 answers:
galina1969 [7]3 years ago
8 0

Answer:

Width = 10 feet

Length = 15 feet

Step-by-step explanation:

Let the width = x feet

Length = x + 5

Perimeter = 50 feet

2 * ( length  + width) = 50

2 * (x+5 + x) = 50

       2x + 5 = 50/2

       2x + 5 = 25

               2x = 25 - 5 = 20

                 x = 20/2 = 10

Width = 10 feet

Length = 10 + 5 = 15 feet

OleMash [197]3 years ago
5 0

Answer:

The length of a rectangular lot is 15 feet

Step-by-step explanation:

Let the width of rectangle be x

We are given that the length is five feet more than the width.

Length of rectangle = x+5

Perimeter of rectangle =2(l+b)=2(x+5+x)=2(2x+5)=4x+10

We are given that perimeter is 50 feet

So,4x+10=50

4x=40

x=10

So, Length of rectangle = x+5=10+5=15

Hence the length of a rectangular lot is 15 feet

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1 year ago
The lifetime of a certain type of TV tube has a normal distribution with a mean of 61 and a standard deviation of 6 months. What
Ad libitum [116K]

Answer:

P(57

P(-0.67

P(-0.67

Step-by-step explanation:

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".  

Solution to the problem

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P(57

And the best way to solve this problem is using the normal standard distribution and the z score given by:

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If we apply this formula to our probability we got this:

P(57

And we can find this probability like this:

P(-0.67

And in order to find these probabilities we can use tables for the normal standard distribution, excel or a calculator.  

P(-0.67

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