What is the first step needed to solve (1)x-3=-18?
Add 3 to both sides
Subtract 18 from both sides
Multiply both sides by 3
Divide both sides by 4

Having a hard time understanding this question (see attachment).

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%

Find the solution on the interval [0, 2pi)