PLEASE HELP 15 POINTS please give right answer

To determine the number of deer in a forest a forest ranger tags 280 and releases them back

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%