Round 66,315,254 to the nearest ten-million

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

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.

Can you me find the missing length. i attached an image.