math

posted by .

pierre was born in the twentieth century and will be x years old in the year x squared. In what year was pierre born

  • math -

    Let y be the year of his birth. x^2 is the year when he is x years old.
    x^2 - y = x
    x^2 -x = y must be between 1900 and 2000
    Try x = 45. His birth year would be 1980
    If x = 46, his birth year would be 2070 (too late)
    If x = 44, his birth year would be 1892 (too early).

    So the birth year is 1980

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. SS

    Which of the following is elegible to run for the presidency: a 45 year old banker who was born and raised in Wyoming or a 30year old state legialator who was born in Virginia, lived abroas for 10 years then returned to Virginia?
  2. Social Studies

    I am doing a project where I need to know the number of people born in America in the year 1991. How many were born that year?
  3. government

    Which of the following is eligible to run for the presidency: a 45-year old banker who was born and raised in Wyoming or a 30-year-old State legislator who was born in Virginia, lived abroad for 10 years, then returned to Virginia?
  4. math

    The year 1991 was the last year of the twentieth century whose number is a palindrome, that is, reads the same backward and forward. How many years between the years 2000 and 3000 will be palindromic?
  5. Math

    The mathematician Augustus DeMorgan lived his entire life during the 1800s. In the last year of his life he announced "Once I was x years old in the year x^2". In which year was he born?
  6. math hw

    in a recent year, 286 female deer were born in clark county. this is 93 fewer than the number of male deer born. how many male deer were born that year?
  7. Math

    The U.S life expectancy of a baby born in 1960 was 69.8 years. For a birth year of 2010, the U.S life expectant was 78.5 years. Let Y be the US life expectancy for a baby born in the year x, where x=0 represents the year 1960. What …
  8. finance

    Starting a year from now and making 10 yearly payments, Pierre would like to put into a retirement account enough money so that, starting 11 years from now, he can withdraw $30000 per year until he dies. Pierre is confident that he …
  9. maths

    Jake is mapping out important family events. He uses negative numbers to represent time before he was born and positive numbers to represent time after he was born. For example, Jake's mum was born in year −20, and Jake's sister …
  10. Math

    Lily was born in 100Bc and was 56 years old when she died .in what year did she die?

More Similar Questions