What is the difference between sigma (1+3n) and (3i-5)?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers

Atown has a population of 12000 and grows at 3.5% every year. what will be the population after 7 years, to the nearest whole number?