Aclerk has 1/2 book of stamps on monday. on tuesday, he used 1/10 of the book of stamps. how much of the book of stamps is left?

a) 3/10
b) 2/5
c) 3/5
d) 9/10

Prove the divisibility of the following numbers: 25^9 + 5^7 is divisible by 30.also, read as (25 to the power of 9) + (5 to the power of 7) is divisible by 30. blank x 30what is the blank? ( it should be expressed in exponent form)

Boris needs to buy plastic spoons. brand a has a box 42 spoons for $2.37. brand b has a box of 72 spoons for $3.57. find the unit price for each brand. then state which brand is the better buy based on the unit price. round your answer to the nearest cent.

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).