Oliver picks a 4-digit even number that is greater than 3000. The second digit is a multiple of 4.
How many different numbers could Oliver pick?

Please help me!!! The right answer is 699, but please be really kind to show me the working out

The number of revolutions of two pulleys is inversely proportional to their diameters. if a 24-inch diameter pulley making 400 revolutions per minute is belted to an 8-inch diameter pulley, find the number of revolutions per minute of the smaller pulley.

What is the surface area of the sphere?

As a self-employed seamstress, you know that it takes 7 yards of material to make 3 jackets. you bought 15 yards of material to make 7 jackets. did you buy enough material? if not, how much were you over or under?