How many pairs (a, b), where a and b are positive integers, satisfy the equation a2−b2=105?

If the graphs of the linear equations in a system are parallel, what does that mean about the possible solution(s) of the system? a. there are infinitely many solutions. b. there is no solution. c. there is exactly one solution. d. the lines in a system cannot be parallel.

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)

East black horse $0.25 total budget is $555 it'll cost $115 for other supplies about how many flyers do you think we can buy