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3 years ago

14

I really need help !!

1 answer:

Gnesinka [82]3 years ago

7 0

Your proportion is
(65 mi)/(19 gal) = (x mi)/(57 gal)

Multiply by (57 gal/mi) to solve the problem.
57(65/19) = x = 195

The boat can travel 195 miles on 57 gallons of gas.

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Lisa takes 3 hours to mow the lawn, while her cousin, Barb, takes 2 hours. How long will it take them working together?

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Answer:6 hours

Step-by-step explanation:

3x2=6

5 0

3 years ago

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Write an expression that is equivalent to 3(2t+6)-4t.

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Use the distribution property.

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3 years ago

How to find lateral surface

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3 years ago

the performance score of 10 adults is recorded, and the results are 83 87 90 92 93 100 104 111 115 121 find the standard deviati

luda_lava [24]

Answer:

The standard deviation of the data set is $\sigma = 12.7906$ .

Step-by-step explanation:

The Standard Deviation is a measure of how spread out numbers are. Its symbol is σ (the greek letter sigma)

To find the standard deviation of the following data set

$\begin{array}{cccccccc}83&87&90&92&93&100&104&111\\115&121&&&&&&\end{array}$

we use the following formula

$\sigma = \sqrt{ \frac{ \sum{\left(x_i - \overline{X}\right)^2 }}{n-1} }$

Step 1: Find the mean $\left( \overline{X} \right)$ .

The mean of a data set is the sum of the terms divided by the total number of terms. Using math notation we have:

$Mean = \frac{Sum ~ of ~ terms}{Number ~ of ~ terms}$

$Mean = \frac{Sum ~ of ~ terms}{Number ~ of ~ terms}=\frac{83+87+90+92+93+100+104+111+115+121}{10} \\\\Mean = \frac{996}{10} =\frac{498}{5}=99.6$

Step 2: Create the below table.

Step 3: Find the sum of numbers in the last column to get.

$\sum{\left(x_i - \overline{X}\right)^2} = 1472.4$

Step 4: Calculate σ using the above formula.

$\sigma = \sqrt{ \frac{ \sum{\left(x_i - \overline{X}\right)^2 }}{n-1} } = \sqrt{ \frac{ 1472.4 }{ 10 - 1} } \approx 12.7906$

3 0

3 years ago

Tessa has $42 to spend at the county fair. Her admission

Semenov [28]

Answer

g is less than or equal to 34.50

Step-by-step explanation:

$42-$7.50=$34.50

7 0

3 years ago