PLs help

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

Darren earned $663.26 in net pay for working 38 hours. he paid $118.51 in federal and state income taxes, and $64.75 in fica taxes. what was darren's hourly wage? question options: $17.45 $19.16 $20.57 $22.28

Which point-slope form equation represents a line that passes through (3,-2) with a slope of -4/5