Bikes cost $47 each. how much change will i have from $300 if i buy two bikes?

The circumference of a circle is 5 pi cm. what is the area of the circle?

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?

Let x = a + bi and y = c + di and z = f + gi. which statements are true?