A proper subset of a set is a subset of that is not equal to . In other words, if is a proper subset of , then all elements of are in but contains at least one element that is not in
Answer:

Step-by-step explanation:
The angle of depression is the angle formed by the horizontal at the camera position and the line formed by the camera and the objective, therefore it can be calculated from the information provided as shown in the attached file:
First, you draw f' and f" as parallel lines to the floor at the height of the objective and the height of the camera respectively. Then draw the line o between camera and objective.
the blue angle created by o and f" is the depression angle, which is the same as the angle created by o and f' because angles between parallel lines.
You need to calculate b, as:
b = h - a = 9 - 6 = 3
Then, for the trigonometric function tangent as we have a rectangle triangle:
therefore:


Answer:
y = -17
Step-by-step explanation:
3y + 20 = 3 + 2y
Collect like terms
We have 3y - 2y = 3 - 20
y = -17
STEP 1:
You need to find the area of the circular pad.
Circle Area= πr^2
we need the radius which is half of the diameter given
=π(50÷2)^2
=(3.14)(25)^2
=(3.14)(625)
=1,963.495 ft^2 total area
STEP 2:
Find how much paint is needed by dividing a can's coverage into what's needed.
=1963.495 ÷ 200
=9.817
=10 cans are needed (because you cannot buy a part of a can, you need to round up)
ANSWER: 10 cans are needed
Hope this helps! :)