Which equations represent linear functions?

A)

2x + 3y = 10

B)

x = 16

C)

2x2 - 3 = 14

D)

y = 18

There were 816 people at a concert when a band started to play. after each song, only half the people stayed to hear the next song. how many people were left at the concert after x songs? write a function to represent this scenario.

You have $600,000 saved for retirement. your account earns 5.5% interest. how much, to the nearest dollar, will you be able to pull out each month, if you want to be able to take withdrawals for 20 years?

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.