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Bogdan [553]
3 years ago
5

What the value of the expression 4(a2-b2) when a= -5 and b=3

Mathematics
1 answer:
Schach [20]3 years ago
8 0

Answer:

4(-5*3-3*2)

=4(-15-6)

=4(-21)

= -84

Hope this will help:-)

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What is the value of <br> (<br> 7<br> 10<br><br> )<br> 3<br> ?
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Answer:

210

Step-by-step explanation:

Your answer is 210. Assuming that the correctly formatted question is (7x10) 3, you would solve the problem like this.

First, always start with what's in parenthesis.

(7x10) = 70

Now that we have 70, we can multiply it by the remaining number, 3.

(70) 3  also known as  70x3 = 210.

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Tom fills up his car gas tank. If he pays$49.27 for 11.35vgallons of gas what is the price per gallon?
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Step-by-step explanation:

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<h2>A. 10x + 30</h2>

Step-by-step explanation:

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What will be the answer ??
Otrada [13]

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4 years ago
Find the area of the region that lies under the parabola y=5x - x^2, where 1≤x≤4. I would definitely like to see some work :)
Elena L [17]

Answer:

  16.5 square units

Step-by-step explanation:

You are expected to integrate the function between x=1 and x=4:

  \displaystyle\text{area}=\int_1^4{(5x-x^2)}\,dx=\left.\left(\dfrac{5}{2}x^2-\dfrac{1}{3}x^3\right)\right|_{x=1}^{x=4}\\\\=\dfrac{5(4^2-1^2)}{2}-\dfrac{4^3-1^3}{3}=37.5-21=\boxed{16.5}

__

<em>Additional comment</em>

If you're aware that the area inside a (symmetrical) parabola is 2/3 of the area of the enclosing rectangle, you can compute the desired area as follows.

The parabolic curve is 4-1 = 3 units wide between x=1 and x=4. It extends upward 2.25 units from y=4 to y=6.25, so the enclosing rectangle is 3×2.25 = 6.75 square units. 2/3 of that area is (2/3)(6.75) = 4.5 square units.

This region sits on top of a rectangle 3 units wide and 4 units high, so the total area under the parabolic curve is ...

  area = 4.5 +3×4 = 16.5 . . . square units

4 0
3 years ago
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