What value would you substitute in place of the "t" in the simple interest formula for a investment of $1000 at 4.35% simple interest for a term of 18 months ???

multiplication is multiplication.   it might feel harder depending on what level of math you are in, but generally it will be the same old stuff, while implementing some new concepts and methods of solving work.

the answer to this would be 5x^3-6x^2-24 over 3x^2

hope this if needed hmu

3/8