Jim wants to buy a computer. the total cost is $1,180. if he can save $60 a month, how long will it take for him to save up for the computer? round your answer to the nearest month

Me because some of question i don’t understand

Three times the sum of a number and seven is negative thirty-six. what is the number?

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)