A postal clerk sold some 15 cent stamps and some 25 cent stamps. Altogether, 15 stamps were sold for a total cost of $3.15. How many of each type of stamp were sold?

my guess would be b and d, but i didn’t actually get out the pen and paper. lol

for this case we have that by definition, the surface area of a cylinder is given by:

where:

r: it is the radius of the cylinder

h: it is the height of the cylinder

we can also rewrite it as:

where:

la: it's the lateral area

ba: area of the base

option a