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

Avery’s piggy bank has 300 nickels, 450 pennies, and 150 dimes. she randomly picks three coins. each time she picks a coin, she makes a note of it and puts it back into the piggy bank before picking the next coin.