the post office charges for mail based on the letter. the first 100 grams costs $4.50 and each additional 50 gram (or part of 50 gram) costs $0.95

Three consecutive integers have a sum of 234. what are the three integers

The half-life of a certain material is 0.004 second. approximately how much of a 20-gram sample will be left after 0.016 second? a. 5 grams b. 16 grams c. 0.32 gram d. 1.25 grams

Ben frank is an electrician who installs lighting fixtures. he charges (in dollars) his clients 15h+40f15h+40f where hh is the number of hours worked and ff is the number of fixtures installed. how much does ben frank charge when he works 77 hours and installs 99 fixtures?