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Anna007 [38]
3 years ago
5

F(x) = 2x2 + 5x + 20 Find f(-9)

Mathematics
2 answers:
chubhunter [2.5K]3 years ago
8 0

Answer: f(-9)=137

Step-by-step explanation:

To find f(-9), you plug in -9 into x.

f(-9)=2(-9)²+5(-9)+20                           [solve parenthesis]

f(-9)=2(81)-45+20                                 [multiply]

f(-9)=162-45+20                                   [subtract]

f(-9)=117+20                                          [add]

f(-9)=137

Yuri [45]3 years ago
6 0
I got f(-9)= 4

Explanation
F(-9)= 2(-9)2+5(-9)+20
F(-9)=-36+20+20
F(-9)=4

I’m not 100% but that’s what I got
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3 years ago
A rectangle is constructed with its base on the​ x-axis and two of its vertices on the parabola y equals = 100 100 minus −x squa
masha68 [24]

Answer:

Step-by-step explanation:

Given that a rectangle is constructed with its base on the x axis and two of its vertices on the parabola

y=100-x^2

This parabola has vertex at (0,100) and symmetrical about y axis.

Any general point above x axis can be written as (a,b) (-a,b) since symmetrical about yaxis.  

Hence coordinates of any rectangle are

(a,0) (-a,0), (a, 100-a^2), (-a, 100-a^2)

Length of rectangle = 2a and width = 100-a^2

Area of rectangle = lw = 2a(100-a^2)=200a-400a^3

To find max area, use derivative test.

A' = 200-800a^2\\A"=-1600a

Hence maxima when first derivative =0

i.e. when a =2

Thus we find dimensions of the rectangle are l =4 and w = 96

Maximum area = 4(96) = 384

5 0
3 years ago
For finding the circumference of a circle: can an arc determine the circumference of a circle, yes or no
Ivanshal [37]

Answer:

yes , an arc can indeed determine the circumference of a circle

3 0
4 years ago
Ty has 230 pages of text to read in the next three days. if he averages 25 pages every 1 1/4 hours, how many hours is he going t
sineoko [7]

Answer:

11.5 hours

Step-by-step explanation:

25 pages every 75 minutes (1 1/4)

Thats means 1 page every 3 minutes (divide 25 and 75 by 25 to get this)

230 pages would mean 690 minutes (times the 3 by 230)

690/6 = 11.5

7 0
3 years ago
(GIVING BRAINLIEST!!)
Montano1993 [528]

Answer:

6450

Step-by-step explanation:

1kg = 1000g

6.45 x 1000 = 6450

3 0
3 years ago
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