Will the product be positive or negative? Explain (-13)x...x(-13)

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.

Polygon abcde is reflected to produce polygon a′b′c′d′e′. what is the equation for the line of reflection?