David Copperfield did this number trick: pick a number
add 12
divide by 4
subtract 7
multiply by 2
PART 1: Write the number trick as an algebraic expression

PART 2: David's result was -10. What number did he pick? Show or explain how you got your answer.

Atown recently dismissed 5 employees in order to meet their new budget reductions. the town had 5 employees over 50 years of age and 19 under 50. if the dismissed employees were selected at random, what is the probability that exactly 2 employees were over 50? express your answer as a fraction or a decimal number rounded to four decimal places.