Marianne has a party with a total of 20 people in attendance. She plans to spend $5.50 to feed each adult and $4.50 to feed each child. How many adults are at the party if the total cost of food is $98.00?

Given the choice between receiving $1.000.000 in one month or a single penny-doubled everyday for the period of one month; which option would you choice? show your work to support your answer. (assume that 1 month=30 days)

Which shows one way to determine the factors of 4x3 + x2 – 8x – 2 by grouping?

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.