Determine the value of a so that a = 2i+aj+k and b = 4i-2j-2k are perpendicular

Kelly is three years younger than her sister. the sum of their ages is 34 years. how old is kelly and how old is her sister?

Solve for x and select the correct answer

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