Write an inequality for the situation. All real numbers y that are less than 4 or greater than 9

Liam's parents are driving three times as fast as liam is biking, but they left later than he did. if his parents caught up with him two hours after he left, how much later than liam did they leave?

Solve 2x+y=3 x+y=5 in substitution method

X^2/100+y^2/25=1 the length of the major axis is: a)5 b)10 c)20