120,000 people.
110,000 - 100,000 = 10,000
110,000 + 10,000 = 120,000 peoples.
X = 6 cos(t)
y = 3 sin(t)
we can rewrite these equations as:

Taking squares of both equations we get:

Adding both the equations, we get:
The answer is A. If 9 pencils cost $7.74, we have to divide the total cost ($7.74) by the number of pencils (9) to obtain the price of 1 pencil. Now that we have the price of 1 pencil, to obtain the cost of 6 of them we simply multiply the result by six.
The correct equation is 8.7 + b = 54.6
because it is given that measure of side a is 8.7cm, in all other equations the values of a is different.
from the first equation we can find the value of b, that is
b = 54.6 - 8.7 = 45.9
so, value of b is 45.9cm