What is the amplitude of f(x) = -2 sin (3x)

Cynthia takes her dog to the park every 2 days. she bathes her dog every 7 days. if she took her dog to the park and bathed him today, how long will it be until she does both on the same day again?

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

True or false look at the picture pls : /