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3 years ago

F(x)=-x^2-9x find f(-2)

Mathematics

1 answer:

Sloan [31]3 years ago

8 0

Answer:

Step-by-step explanation:

put -2 where x is

f(x)=-x^2-9x

f(-2)= -(-2)^2 -9(-2)

f(-2)= -4 + 18

f(-2)= 14

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I need help, please and thank you. I know that you have to multiply the diameter by 2 to find the radius, but with the 9 pi, it

andrew11 [14]

Answer:

r=6

Step-by-step explanation:

The area of a circle is given by πr². Note that this uses the radius, not the diameter.

Now, one quarter of this area (ABC) is given to be 9π.

So apparently:

$\frac14 \pi r^2 = 9\pi$

If you solve this:

$\frac14 r^2 = 9$ (divide both sides by π)

$r^2 = 9\cdot4$ (multiply both sides by 4)

r = √36 = 6

so the radius is 6.

4 0

3 years ago

A line contains the points (-26, -37) and (32, -61)

Slav-nsk [51]

The slope of line through given points is -12/29

Step-by-step explanation:

Given points are:

(-26, -37) and (32, -61)

Let

(x1,y1) =(-26, -37)

And

(x2,y2) = (32, -61)

Slope (steepness) of a line, denoted by m, is given by the formula

$m = \frac{y_2-y_1}{x_2-x_1}$

Putting the values

$m = \frac{-61-(-37)}{32-(-26)}\\\\=\frac{-61+37}{32+26}\\\\=\frac{-24}{58}\\\\=-\frac{12}{29}$

Hence,

The slope of line through given points is -12/29

Keywords: Slope, line segment

Learn more about slope at:

#LearnwithBrainly

5 0

3 years ago

Please help

Vladimir [108]

The given info gives you two pairs of congruent angles.
Side RS is the included side. It is a side of both triangles, and it is congruent to itself. Since you now have side RS congruent to side RS, you can use ASA.

8 0

2 years ago

Read 2 more answers

Do the points 3, -3 1, -2 1, 1 -3, 2 -1, 3 -5, 4 form a function??????? please i need help

neonofarm [45]

-5,-3,-3,-2,-1,1,1,1,2,3,3,4

5 0

3 years ago

Let b = 7.<br> What is the value of the expression 462 +b-5?<br> Enter your answer in the box.

Phantasy [73]

Start by plugging in 7 in for <em>b</em> in the expression.

So we have 46² + (7) - 5.

Now, PEMDAS tells you to deal with

your exponents before multiplying.

So 46² means 46 · 46 or 2,116.

So we have 2,116 + (7) - 5.

Now add 2,116 + 7 to get 2,123.

Now subtract 5 to get 2,118.

7 0

3 years ago