An initial investmant of $3,000 grows at 8% per year. what function represents the value of the investment after t years

Frank has a devised a formula for his catering business that calculates the number of meatballs he needs to prepare. the formula is m=4a+2c, where c=number of children; m=number of meatballs; a=number of adults. how many meatballs are required for a party of 10 adults and 5 children?

A11 gram sample of a substance that’s used to treat thyroid disorders has a k-value of 0.1247

Me with these questions , i don’t understand scientific notation!