Please answer all questions for 30 points brainliest to best answer
(please do graph as well)

An objects motion is described by the equation d= 4sin (pi t) what will the height of the object be at 1.75 seconds?

Convert 50 kilogram to pounds. (the conversion factor from kilogram to pound is 2.2046.) a. 52.2 lb. b. 110.2 lb. c. 22.6 lb. d. 47.8 lb.

Complex numbers multiply √-4 * √-25 and show all intermediate steps. alternative notation is sqrt(-4) * sqrt(-25).