Question

Please help?! I don't understand!

Answer 1

(Problem Number Five Answer: Simplify exponent so you get -3)
(Problem Number Seven Answer: 

Step 1: Simplify brackets

$4 x^{2} y^{3} *7xy$

Step 2: Gather like terms
  $4 * 7 x^{2} x y^{3} y$

Step 3: Use Product Rule $x^{a} x^{b= x^{a+b} }$

$4* 7 x^{2+1} y^{3+1}$

Step 4: Simplify 2+1 to 3

$4*7 x^{3} y^{3+1}$

Step 5: Simplify 3 + 1 to 4
$4*7 x^{3} y^{4}$

Step 6: Simplify

$28 x^{3} y^{4}$

Done! :)
(Problem Number 9 answer: Simplify the exponent so you get -5 )