Which sets of numbers are closed under subtraction?
choose all answers that are correct.
a.
odd natural numbers
b.
rational numbers
c.
{0, 1}
d.
{0, 1, 2}
sorry for bugging you i just don't get it

Kevin and randy muise have a jar containing 78 coins, all of which are either quarters or nickels. the total value of the coins in the jar is $13.90. how many of each type of coin do they have?

Find csc x if sin x + cot x cos x =√3 a. 9 b. 3 c. √(3)/2 d. √(3)

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