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2 years ago

Find f(-1) given f(x) = –2x^3 + 3x^2 – 22

Mathematics

1 answer:

MArishka [77]2 years ago

6 0

$\\ \sf\longmapsto f(-1)$

$\\ \sf\longmapsto -2x^3+3x^2-22$

$\\ \sf\longmapsto -2(-1)^3+3(-1)^2-22$

$\\ \sf\longmapsto -2(-1)+3(1)-22$

$\\ \sf\longmapsto 2+3-22$

$\\ \sf\longmapsto 5-22$

$\\ \sf\longmapsto -17$

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in an election between two candidates one got 55% of the total valid votes 20% votes were invalid if the total number of votes w

timurjin [86]

Answer:

25%- 1875 Votes

7500 x 0.55 = 4125 (first candite valid votes)

7500 x 0.20 = 1500 (invalid)

first candite valid votes (55) + invalid votes (20) = 75% of total votes

first candite valid votes (4125) + invalid votes (1500 ) = 5625 of total votes

100 (total percent of votes) - 75 (total percent of votes) = 25% Votes Left

7500 (total number of votes) - 5625 (total number of votes) = 1875 Votes Left

7500 x 0.25 = 1875 (valid votes for the other candite)

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3 years ago

ASAP HELP! Which equation is NOT linear?

Rus_ich [418]

Answer:

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Step-by-step explanation:

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3 years ago

triangle ABC is isosceles, angle B is vertex angle , AB = 20x -2, AC =25x, and BC =12 x +20. Find x and the length of each side

lisov135 [29]

Length of AB = 18. 92

Length of AC = 26. 15

Length of BC = 32. 552

<h3>How to determine the sides of the triangle</h3>

Using the Pythagorean theorem, we have that

$(20 x-2)^2 = (12x + 20)^2 + (25x)^2$

Expand the bracket

$400x^2- 4 = 144x^2 + 400 + 625x^2$

Collect like terms

$400x^2 - 144x^2 - 625x^2 = 400 + 4$

$-369x^2 = 404$

Make x^2 subject

$x^2 = \frac{404}{369}$

$x = \sqrt{1.0948}$

$x = 1. 046$

Thus,

Length of AB = 20x -2 = 20(1. 046) - 2 = 18. 92

Length of AC = 25x = 25* 1.046 = 26. 15

Length of BC = 12x + 20 = 12(1. 046) + 20 = 32. 552

Learn more about isosceles triangles here:

brainly.com/question/1475130

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2 years ago

Solve the system below by substitution. Give your answer as an ordered pair.

bearhunter [10]

Work:
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2x+30x+115=-13
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x=-4

y=6(-4)+23
y=-24+23
y=-1

The answer is (-4,-1)

Hopefully this helps!

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3 years ago

Graham sold six magazines less than double what Adriannne sold, a. Which of the following expressions represents Graham’s sales

Eva8 [605]

The best and most correct answer among the choices provided by your question is the fourth option or letter D. The expression that represents Graham's sales is 2a − 6. Twice the sales of Adrianne, deducted by 6 should be Graham's sales.

Hope this helps!

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3 years ago