exam Maths Puzzle Numerical Ability

Dr. Sand borrowed some money for new furniture. She paid $245. simple interest on a 3.5 year loan at 3.5%. Find the principle.
Please help,
Ellen

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exam Other Question

How do I prove that this equation is a circle, and what is the center and the radius?
{{{ 3x^2+3y^2+12x-6y+18=0 }}}

I put the equation into standard form and got:

{{{ (x+2)^
What is the best way to divide an algebraic expression that is in parenthesis?
(2x^3 - x^2 + 3x - 1) divided by (x + 2). Thank you for your help.