how many of the first 80 positive integers can he written as the sum of two distinct powers of 3? for example, 28=27+1=3^3+3^0 can be expressed, but 29 cannot be.

In 1930, the average cost for a gallon of gasoline was $0.25. in 2007, the average cost for a gallon of gasoline is $2.60. what is the percent of increase rounded to the nearest whole number

You are makeing a water paste. You add 1/4 cup of the paste. Your friend adds 1/2 cup of water to the paste. How much water did the two of you add

The sum of three numbers is 45 one number is 10 more than the second number it is also twice the third number find the numbers

There are 12 students in a jewelry making class and 8 sets of charms. What fraction of a set of charms will each student get

21% of college students say they use credit cards because of the rewards program

There are 8 Apples and some bananas on the counter. Someone buys 3 apples. Now there are 4 more bananas than apples. How many bananas are there?

You sold the most for your school's fundraiser so you get to enter the cash vault. There are $1, $5,$10 and $20 bills. The probability of picking a $1 bill is 48%, a $5 bill is 26%, a $20 bill is 10%. What is the probability of picking a $10 bill?

Factor out the greatest common factor from the polynomial 9x-27y+9=

What strategy would use to divide 36 by 6 explain why you chose that strategy

At a concert 5/9 of the people in line are girls. 2/3 are wearing glasses, what fraction of the people are wearing glasses?