Arectangular pyramid is sliced so the cross section is perpendicular to its base and passes through its vertex. what is the shape of the cross section?

How do you use the elimination method for this question? explain, because i really want to understand!

Acollection of coins has value of 64 cents. there are two more nickels than dimes and three times as many pennies as dimes in this collection. how many of each kind of coin are in the collection?

Complete the conditional statement. if a + 2 < b + 3, then a < b b < a a – b < 1 a < b + 1