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blsea [12.9K]
3 years ago
15

F(x)=-4x^2+9 Find f(−3)

Mathematics
1 answer:
pochemuha3 years ago
8 0

Answer:

f (-3) = 45

Step-by-step explanation:

f (x) =

4x {}^{2}  + 9

f (-3) =

(4 \times  - 3 \times  - 3) + 9

=》

36 + 9

=》

45

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Carol is standing 8 feet from a lamppost. The angle of elevation from her eyes to the top of the lamppost is 20o, and the angle
kupik [55]

Answer:

Height of the lamppost = 5.602 ft + 2.912 ft = 8.514 ft

Step-by-step explanation:

The illustration form a triangle that can be demarcated into 2 right angle triangle. One triangle representing depression triangle and the other elevation triangle.

Depression triangle

The opposite side of the triangle formed is the length of the pole from the base to the horizontal line of sight. Therefore,

using tangential ratio

tan 35° = opposite/adjacent

tan 35° = a/8

cross multiply

a = 8 tan 35°

a = 8 × 0.70020753821

a = 5.60166030568

a = 5.602 ft

Elevation triangle

The opposite side of this right angle triangle represent the length from the horizontal line of sight to the top of the lamppost.

tan 20° = opposite/adjacent

tan 20° = b/8

cross multiply

b = 8 tan 20°

b = 8 × 0.36397023426

b = 2.91176187413

b = 2.912 ft

Height of the lamppost = 5.602 ft + 2.912 ft = 8.514 ft

8 0
3 years ago
Is 0.069 less than 0.07
Nuetrik [128]
Yes, 0.069 is less than 0.07~

First, we compare the "one" place: 0 = 0.

Second, we compare the "tenth" place: 0 = 0.

Next, we compare the "hundredth" place: 6 < 7.

Because 6 < 7, 0.069 < 0.07 as a result~
6 0
3 years ago
Why do purely competitive markets tend to benefit consumers over producers? Companies control quality and supply. Companies work
Tom [10]
In general, purely competitive markets tend to benefit consumers over producers because "<span>Consumers control price through demand". Although perfect competition is practically impossible. </span>
3 0
4 years ago
Read 2 more answers
Can someone please help I really need this to be correct.
kupik [55]
I think it’s 22 or 23...I’m so sorry if it’s wrong :/
8 0
3 years ago
If f(x)=3x^2-4x+9, find the f(2)​
kipiarov [429]

Answer:

13

Step-by-step explanation:

3(2)(2) -4(2)+9

12 -8 +9= 13

6 0
3 years ago
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