Is this non-linear? If not, what’s the rate of change? Please show your work, I’m kind of confused.

Which letters from the table represent like terms? a and b b and c a and d b and d

Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?

The population of a bacteria colony grows by a consistent percentage each hour and can be modeled by the function y = 500(1.16)t. what does the value 500 represent in the function?