If the infinite curve
y = e−9x, x ≥ 0,
is rotated about the x-axis, find the area of the resulting surface.

Which of the following are accepted without proof in a logical system? check all that apply.

Thales was an ancient philosopher familiar with similar triangles. one story about him says that he found the height of a pyramid by measuring its shadow and his own shadow at the same time. if the person is 5-ft tall, what is the height of the pyramid in the drawing?

Satchi found a used bookstore that sells pre-owned dvds and cds. dvds cost $9 each, and cds cost $7 each. satchi can spend no more than $45.