Mark's parents deposited $1,200 into an account when he was born. How much interest will the account have earned after 18 years at a 1.5 simple interest rate

Step-by-step explanation:

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addition

step-by-step explanation:

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!