Since (3/4)^2=3/4•3/4=9/16 what is the value of 2/5^2

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

An object is accelerating at a constant rate. its velocity in feet per second as a function of time in seconds can be modeled by the linear function v(t) = 2.5t. what does the dependent variable represent for this function? a) acceleration b) distance c) slope d) velocity

Calculate ∬y da where r is the region between the disks x^2+y^2 < =1 & x^2+(y-1)^2 < =1 show all work. (also explain why you split up the regions)