Is there a better explaination for part 2 because i dont get how they got there

Pls help on this question. Also, pls refer to both images to see what needs to be done.

Please help me with question #7 with as much explanation as possible please. I really want to understand this

Given Q(x, y) means "x and y are real numbers such that x + 2y = 5", evaluate 3vy Q(x, y) O True O False

I'm confused with question 14 because I cant find an example to follow. Could you help, please? Thank you.

If x > 0, which of the following is equivalent to Vr5? I. „² + æx!/2 II. (x/2)5 III. „3,-1/2

I need help on the rest of these. Only the parts I have written down are on here

Please help me with these two questions. I don't understand what to do

For "x is in the symmetric difference of A and B" give an equivalent statement that uses "x is in A"  and "x is in B".

I needed help with part d. (d) between 160 and 161, inclusive are on time  But it was nice to double check my answers, but there was no answer for part d   Could someone please assist