How many 7-digit phone numbers can be formed if the first digit cannot be 0 and repetition of digits is allowed?

7,000,000

9,000,000

181,400

none of the above

The number of 8th graders who responded to a poll of 6th grade and 8 th graders was one fourtg of the number of 6th graders whi responded if a total of 100 students responddd to the poll how many of the students responded were 6 th graders

You have 12 balloons to blow up for your birthday party. you blow up 1/3, and your friend blows up 5 of them. what fraction of the baloons still need blowing up

The sum of the squares of two numbers is 8 . the product of the two numbers is 4. find the numbers.