Mr. o'connel spends 15% of his salary on food, 24% of it on transportation, and saves the remaining $1,830. what is his salary?and show work.

5500 dollars is placed in an account with an annual interest rate of 6.5%. to the nearest tenth of a year, how long will it take for the account value to reach 19700 dollars?

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

What is the period of the sinusoidal function ?