The inch is the smallest unit of length. a foot is equal to 12 inches. The yard is the next longest. The mile is the longest measure.
X^2 + y^2 = r^2
15^2 + (-8)^2 = [sqrt(17)]^2
r= 17
cos(theta) = x/r = 15/17
Letter B
15 books, because it asked for DIFFERENT books not the same. Just take the same book away from each individual child and add the rest and it equals 15.
The answer would be Square
Let us think about the trigonometric functions. If we have a right triangle with an angle we call x. Then we define the trigonometric functions as follows:
cos x = adj/hyp
sin x = opp/hyp
tan x = opp/adj
Where opp is the measure of the side opposite the angle x, adj is the measure of the side adjacent to angle x and hyp is the hypotenuse (the longest side).
We are told that cos x = 1/4 which means that the ratio of the side adjacent to the hypotenuse is 1/4. So let’s make adjacent = 1 and the hypoytenuse = 4.
We now have two sides of the right triangle but are missing the third. We use the Pythagorean theorem to find the third side. The Pythagorean Theorem says:

where and b are the lengths of the legs of a right triangle and c is the hypotenuse. For our triangle c = 4, a = 1 and b is the side we don’t know. We could have made b = 1 and solved for a instead since a and b are both legs and can be used interchangeably.
So we end up with the following:

This means that the opposite side =

As a reminder:
opp =

Adj = 1
hyp = 4
Therefore we find sin x and tan x as follows:
sin x = opp/hyp =

tan x = opp/adj =