What number is the same as 3 tens and 12 ones.

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50. write an inequality to determine the number of chores, c, janie could do to have enough money to buy the cd.

Could somebody me with this radical simplification?