Which steps could be used to solve this story problem?

billy had 20 rubber balls and 12 plastic balls. he shared the balls equally among 4 friends.

how many more rubber balls did each friend get than plastic balls?

a.
subtract 12 from 16. then multiply the difference by 4.

b.
divide 20 by 4. divide 12 by 4. then find the difference between the two quotients.

c.
multiply 20 by 4. multiply 12 by 4. then find the difference between the two products.

d.
subtract 4 from 20. subtract 4 from 12. then add the differences together.

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

What is the solution to the division problem below x3+x2-11x+4/x+4

The evening newspaper is delivered at a random time between 5: 30 and 6: 30 pm. dinner is at a random time between 6: 00 and 7: 00 pm. each spinner is spun 30 times and the newspaper arrived 19 times before dinner. determine the experimental probability of the newspaper arriving before dinner.