Roy worked for 2 hours and earned $12. how many hours must he work at the same rate to earn $36? hours worked 2 ? dollars earned 12 36 3 hours 4 hours 6 hours 8 hours

it costs $20 to interview each person for a survey. find the cost to obtain a +- 3% margin of error.

step-by-step explanation:

copy and paste, put it in google

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225