3. a 20 ft ladder is placed next to a building. the ladder forms a 72° angle with the ground. how far is base of the ladder from the base of the building? round your answer to the nearest tenth of a foot. show your work.

6.2 feet.

Step-by-step explanation:

1. You can make a triangle as you can see in the figure attached, where is the distance between the base of the ladder and the base of the building

2. To solve this problem you can apply the following proccedure:

Where

3. Substitute values:

6.2 feet

Step-by-step explanation:

A ladder is placed next to a building which will form a right angled triangle where,

ladder = the hypotenuse,

building = perpendicular; and

distance on the ground between the building and the ladder = base

We know the hypotenuse and the angle formed between the ladder and the ground to be 72°, so we can use the formula for Cos to find the base:

Cos = Base / Hypotenuse

Supposing x to be the base:

Cos (72°) =  x / 20

x = cos (72°) * 20

x = 6.2 feet

Therefore, the base is the ladder is 6.2 feet far from the base of the building.

the range of a function is the range of y-values for which it is defined, or exists. given that we are only looking at the y-values, we can already discount the first two answers as they deal with the domain of the function (range of x-values).

now, what we need to do is find the smallest and highest y-values for which the function is defined. if you'd like, you could take a ruler and start at the very bottom of the graph, find the lowest point, then move the ruler higher and higher until you reach the highest point. doing so either in your head or with an actual ruler, we can see that the lowest y-value is -5 and the highest y-value is -1.

the question now remains as to whether they are included in the range (fourth answer) or excluded (third answer). the key here is to recognise whether they are marked with an open or a closed circle. since both (-2, -5) and (2, -1) are marked with a closed circle, they are points that exist on the graph and are thus included in the range (note that if they were marked with an open circle like (4, -2) then that would signify that there is a break in the graph at that point).

thus, the fourth answer, (y | -5 ≤ y ≤ -1), is correct.

also note that usually it is good practice to scan your eye inbetween the highest and lowest point for any breaks in the graph - we do have one here at (4, -2), however -2 is still included in the range because there is another point that is included in the graph with the same y-value, ie. point (1, -2).

i hope that but if you require any further explanation don't hesitate to comment below.

answer: ok

step-by-step explanation: