What is always true about the numbers in the first column of a table that represents a function? why must this be true?

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b

Aaron invested a total of $4,100, some in an account earning 8% simple interest, and the rest in an account earning 5% simple interest. how much did he invest in each account if after one year he earned $211 in interest? select one: a. $200 at 8%, $3,900 at 5% b. $3,200 at 8%, $900 at 5% c. $900 at 8%, $3,200 at 5% d. $3,900 at 8%, $200 at 5%