How many stamps do i need for a .9oz envelope?

Is 135 prime? What letter grade would be 38 out of 50? How do you 90 percent out of 44? What is the total cost of 3200 with a 8.75 sales tax? What is 6842 round to the nearest thousand? What is 2.065 rounded to the nearest cent? How do you work out 30 percent of something? What is the greatest common factor of 12 40 and 68? What are the common factors of 45 and 675? Why would an available balance be higher than current balance? How much would 20000 in 1600 be worth today? What is the difference between 'mostly' and 'mainly'? If a guy tells you he likes you lots wats he mean? How does 5 go into 450? What is the only composite number less than 5? What is 178 rounded to neatest 100? What is 87.6564 rounded to 2DP? What number is 33 and one third percent of 66? Which numbers have a quotient and a difference of 5? What are the integers between 0 and 10?