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poizon [28]
3 years ago
13

Find f(–4) for f(x) = 9(3)x.

Mathematics
1 answer:
Drupady [299]3 years ago
5 0
Subsitute -4 for x
remember that x^{-m}=\frac{1}{x^m}

so
for x=-4
f(-4)=9(3)^{-4}
f(-4)=9(\frac{1}{3^4})
f(-4)=9(\frac{1}{81})
f(-4)=\frac{9}{81}
f(-4)=\frac{1}{9}
answer is A
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2 sin^2 + sin x - 3 = 0
denpristay [2]

Answer:

x = 2 π n_1 + π/2 for n_1 element Z

or x = π + sin^(-1)(3/2) + 2 π n_2 for n_2 element Z or x = 2 π n_3 - sin^(-1)(3/2) for n_3 element Z

Step-by-step explanation:

Solve for x:

-3 + sin(x) + 2 sin^2(x) = 0

The left hand side factors into a product with two terms:

(sin(x) - 1) (2 sin(x) + 3) = 0

Split into two equations:

sin(x) - 1 = 0 or 2 sin(x) + 3 = 0

Add 1 to both sides:

sin(x) = 1 or 2 sin(x) + 3 = 0

Take the inverse sine of both sides:

x = 2 π n_1 + π/2 for n_1 element Z

or 2 sin(x) + 3 = 0

Subtract 3 from both sides:

x = 2 π n_1 + π/2 for n_1 element Z

or 2 sin(x) = -3

Divide both sides by 2:

x = 2 π n_1 + π/2 for n_1 element Z

or sin(x) = -3/2

Take the inverse sine of both sides:

Answer:  x = 2 π n_1 + π/2 for n_1 element Z

or x = π + sin^(-1)(3/2) + 2 π n_2 for n_2 element Z or x = 2 π n_3 - sin^(-1)(3/2) for n_3 element Z

3 0
3 years ago
Someone help please I need this Answer Immediately!!!!!!
Usimov [2.4K]

Answer:

y = -1/2x - 4

Step-by-step explanation:

5 0
3 years ago
How to do this question?
4vir4ik [10]
She has 3 tops and 3 bottoms if you multiply them you'll get 9. if you do 1,2, & 3 for tops and a, b, & c for bottoms to find the different ways on how she can wear it it'll still be 9. 

1     2     3
a     b     c

1a   2a   3a
1b   2b   3b
1c   2c   3c

8 0
3 years ago
use the point slope formula to write an equation of the line through the point (6,3) that is perpendicular to y=2x-8
Rzqust [24]

Answer:

Step-by-step explanation:

y = 2x - 8. slope here is 2. A perpendicular line will have a negative reciprocal slope. All that means is flip the slope and change the sign.

slope 2 or 2/1.....flip it....1/2....change the sign...-1/2. so our perpendicular line will have a slope of -1/2.

y - y1 = m(x - x1)

slope(m) = -1/2

(6,3)...x1 = 6 and y1 = 3

now we sub

y - 3 = -1/2(x - 6) <==== ur equation

7 0
3 years ago
3.8x = -19. What's the value of x?
iogann1982 [59]
The answer is 2 I think.......
8 0
3 years ago
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