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3 years ago

In the portrait mode, your camera will automatically use the smallest aperture possible.

Mathematics

2 answers:

rodikova [14]3 years ago

7 0

Answer:

Lesson 4 unit 3 quiz questions 1-15

(Photography quiz) I just did these so they are 100% right

1. C

2. B, False

3. A, true

4. A, true

5, B, false

6, D, Manual

7, C, close up of a flower

8. B, Semi-automatic

9. B, false

10. B, false

11. A, True

12. A, f/1.8

13. B, A tripod

14. D, Shutter priority

15. A, True

Step-by-step explanation:

Natali5045456 [20]3 years ago

5 0

False. It will choose a larger aperture for quality.

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3 years ago

Find+the+positive+value+for+α+if+the+radius+of+the+circle+3x^2+3y-6αx+12y-3α=0+is+4

Alik [6]

Answer:

$\alpha=3$

Step-by-step explanation:

Equation of a Circle

A circle of radius r and centered on the point (h,k) can be expressed by the equation

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We are given the equation of a circle as

$3x^2+3y^2-6\alpha x+12y-3\alpha=0$

Note we have corrected it by adding the square to the y. Simplify by 3

$x^2+y^2-2\alpha x+4y-\alpha=0$

Complete squares and rearrange:

$x^2-2\alpha x+y^2+4y=\alpha$

$x^2-2\alpha x+\alpha^2+y^2+4y+4=\alpha+\alpha^2+4$

$(x-\alpha)^2+(y+2)^2=r^2$

We can see that, if r=4, then

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Or, equivalently

$\alpha^2+\alpha-12=0$

There are two solutions for $\alpha$ :

$\alpha=-4,\ \alpha=3$

Keeping the positive solution, as required:

$\boxed{\alpha=3}$

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3 years ago

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