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Stels [109]
3 years ago
10

A rectangular prism has a base area of 56 square feet and a volume of 840 cubic feet. The length of the base is longer than the

width. If the sum of the length and width of the base is equal to the height of the pyramid, what is the length of the base in feet?
Mathematics
1 answer:
katovenus [111]3 years ago
6 0
The answer is 8 ft.

The base area of rectangular prism is: A = l * w = 56 ft²
<span>The length of the base is longer than the width: l > w

The volume of the prism is: V = l * w * h = 840 ft</span>³
<span>The sum of the length and width of the base is equal to the height of the pyramid: l + w = h

So:
</span>l * w = 56
l * w * h = 840
___
56 * h = 840
h = 840 / 56
h = 15 ft

Now, we know that
l + w = 15         ⇒ w = 15 - l
l * w = 56
___
l * (15 - l) = 56
15l - l² = 56
0 = l² - 15l + 56

Or: l² - 15l + 56 = 0

Let's solve the quadratic function:
l = (-b +/-√(b² - 4ac)/(2a)
  = (15 +/-√(-15)² - 4 * 1 * 56))/(2*1)
  = (15 +/- √(225 - 224))/2
  = (15 +/- √1)/2
  = (15 +/-1)/2
 
l = (15+1)/2 = 16/2 = 8
or
l = (15-1)/2 = 14/2 = 7

If l = 8, then w = 15 - 8 = 7.    So, l > w
If l = 7, then w = 15 - 7 = 8.     So, l < w

Therefore, l = 8 ft.
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The solution for the Ship's vector are:

Note that the Horizontal aspect = 30 cos 30  

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Hence it will be  <25.98, -15>.

In regards to the current's vector:

The Horizontal aspect=  5 sin 20

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The Vertical aspect = 5 cos 20

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Hence it will be <1.71, 4.7>.

Therefore, In the case above, the correct vectors are:

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Mrs hawk assigns her students an average of no more than 15 questions on each assignment mrs. hawks students had 11,10,13,14 and
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Answer:

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Step-by-step explanation:

The number of questions in first five assignments are 11,10,13,14 and 14.

It is given that Mrs hawk assigns her students an average of no more than 15 questions on each assignment. Therefore the average of six assignments is less than or equal to 15 questions.

Let the number of questions in sixth assignment be x

\text{Average}=\frac{\text{Sum of observations}}{\text{Number of observations}}

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