Which ordered pair is a solution of the equation y = 3x + 4?

Ican figure out 20 shares multiply by $117.98 =2359.6920 shares multiply by $124.32=2486.40then take 40 shares multiply by $128.48=5139.20after that i'm lost any be greatly appreciated.

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

What is the graph of the absolute value equation ? y=|x|-5