Use boolean algebra to simply: $y=aa+ac+ab+bc$

Use demorgan's theorem on $z=(a^{\text{'}}b{)}^{\text{'}}$

$3$a$.$ Make a truth table for $x=ab+abc+ac{b}^{+}+a{b}^{\text{'}}c$

$3$b$.$ Use a Karnaugh Map to simply x$.$

Solve all questions shown