Explanation

Pneumatic systems are used in:

• Spray guns (to atomize and spray paint or other materials)
• Pumps (to compress and transfer fluids)
• Vacuum cleaners (to create suction and lift dust and debris)
• Dental drill or dentistry tools (to power drills, sanders, and other instruments)

Explanation

Explanation

Explanation

A reflecting telescope uses two mirrors:

1. The primary mirror (which collects and focuses light).
2. The secondary mirror (which directs the focused light to the eyepiece), to form an image of distant objects.

Explanation

Explanation

Explanation

Magnification refers to increasing the size of an image or object.

It is commonly used in optics, like microscopes or lenses, to enlarge small details.

Explanation

The trigonometric identity is:

Sec²θ - Tan²θ = 1

Explanation

Let's break it down step by step:

1. (√9²+12²) = √(81+144) = √225 = 15

2. (-3)² = 9

3. 15 + 9 = 24

4. (-1 + 2 + 3) = 4, and 4³ = 64

5. 24 - 64 = -40

6. ³√-125 = -5 (since (-5)³ = -125)

7. -40 - (-5) = -40 + 5 = -35

Explanation

Let's evaluate each statement:

1. -5 + 1 = -4 (not 4), so this statement is false.

2. 4 - 5 = -1 (true)

3. 2 + (-1) = 1 (true)

4. -7 + (-6) = -13 (true)