Need to understand how to do it with work

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a, b and c integers and a> 1

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%