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pentagon [3]
3 years ago
8

What is f(–3) for the function f(a) = –2a2 – 5a + 4?

Mathematics
2 answers:
olga_2 [115]3 years ago
7 0
Its easy 
just substitute (-3) in the place of 'a'.

f(-3) = -2(-3)^2 - 5(-3) +4
        = -18 + 15 + 4
        = 1

I hope this helped :D
shepuryov [24]3 years ago
4 0
F(-3) = -2(-3)2 - 5(-3) +4
            - 6 x 2 -15 + 4
                - 12 -15 +4
                    - 27 + 4
                           -23

I believe this is how to solve the equation. I could be wrong.

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Brilliant_brown [7]

Answer:

1. 3,168 in³

2. \frac{3}{4}

Step-by-step explanation:

1. The total volume of the tank - as calculated by the formula for a rectangular prism - V=LWH, where L is length, W is width, and H is height. 15 · 24 · 11 = 3,960 in³. Next, we divide 3,960 by five to get 792. If 792 in³ is the air at the top, we can then subtract that from 3,960 and get 3,168. So there are 3,168 in³ of water in the tank.

2. If we dump 3,168 in³ of water into a 12,672 in³ tank, then \frac{3,168}{12,672} of the tank will be full. Simplified, that is \frac{1}{4}. So that means \frac{3}{4} of the tank will be empty.

Hope this helps! Feel free to ask any questions!

6 0
3 years ago
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Kay's mother taught her how to make handmade ornaments to sell at a craft fair. Kay rented a table at
omeli [17]

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2 years ago
A triangular brace has an angle measure of 30 degrees, with a side opposite
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What is the sum of ∞Σn=1 2(1/5)^n-1? s=1/5 s=2/5 s=5/3 s=5/2
lutik1710 [3]

The sum of the sum notation ∞Σn=1 2(1/5)^n-1 is S= 5/2

<h3>How to determine the sum of the notation?</h3>

The sum notation is given as:

∞Σn=1 2(1/5)^n-1

The above notation is a geometric sequence with the following parameters

  • Initial value, a = 2
  • Common ratio, r = 1/5

The sum is then calculated as

S = a/(1 - r)

The equation becomes

S = 2/(1 - 1/5)

Evaluate the difference

S = 2/(4/5)

Express the equation as products

S = 2 * 5/4

Solve the expression

S= 5/2

Hence, the sum of the sum notation ∞Σn=1 2(1/5)^n-1 is S= 5/2

Read more about sum notation at

brainly.com/question/542712

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7 0
2 years ago
Use a graphing calculator to solve the equation -2sin(theta)= 1.2 in the interval from 0 to 2pi.
elena-s [515]

Answer:

\theta=\pi +arcsin(\frac{3}{5})\approx 3.785\\\\\theta=2\pi -arcsin(\frac{3}{5} ) \approx 5.64  

Step-by-step explanation:

As you can see from the graph I attached you, the possible solutions in the interval from 0 to 2π are approximately:

\theta=3.7\\\\and\\\\\theta=5.7

So, it's useful to solve the equation too, in order to verify the result:

-2sin(\theta)=1.2\\\\sin(\theta)=-\frac{3}{5}

Taking the inverse sine of both sides:

\theta=\pi +arcsin(\frac{3}{5})\approx 3.785\\\\\theta=2\pi -arcsin(\frac{3}{5} ) \approx 5.64

Using this result we can conclude the solutions in the interval from 0 to 2π are approximately:

\theta\approx 3.785\\\\\theta \approx 5.64

8 0
3 years ago
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