PLS HELP WITH THESE TWO QUESTIONS NO LINKS

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

If you double the input of a function and it results in half the output, and if you triple the input and it results in a third of the output, what can be guessed about the function? check all that apply.

Sally deposited money into a savings account paying 4% simple interest per year.the first year,she earn $75 in interest.how much interest will she earn during the following year?