Please help me with this, ive gotten a few wrong already and i just need to be sure :(

What is the product? (x2+3y+7) [yy+1)

Which mathematical statements are true? 1) if 3 is an odd number, then 3 times 3 is an even number. 2) if 6 is less than 7, then 4 is greater than 7. 3) six is divisible by 3, and 10 is a multiple of 2. 4) the average of the data is greater than the largest value in the data, or it’s less than the largest value in the data. 5) the slope of a linear graph is its rate of change, and the graph’s y-intercept is the initial value. 6) if an equilateral triangle has equal angles, then all its angles will measure 45°.

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?