If a circle has a diameter of 6 cm, then what is the circumference of the circle?

Ineed me i stuck and i don’t want to get it wrong

Type the correct answer in each box. spell all the words correctly, and use numerals instead of words for numbers. if necessary, use / for the fraction bar(s).

You have 37 coins that are nickels, dimes, and pennies. the total value of the coins is $1.55. there are twice as many pennies as dimes. find the number of each type of coin in the bank.