To express things algebraically, you need to substitute the words with letters, numbers, and equations.
For #1: Product = multiplication. It wants you to express that simple interest equals "p" times "r" times "t". The answer is i=(p)(r)(t) or i=prt
For #2: This is taking the first equation one step further, now giving you some numbers in addition to variables. The "r" has been replaced with 6% (.06), and is asking for 3 different equations. Time is still unspecified, so that remains "t". The question is the interest, so all the equations need to be set to I=.
The answers are:
For #3: This question is unrelated to the previous 2. It's asking the price of flooring tile. It wants "f" square feet, at "c" cents per piece. The cost of the tile can be determined by multiplying the number of pieces by the cost. The answer to this problem is thereby that the cost equals (f)(c) or fc.