math

posted by .

The triangular numbers are the numbers 1, 3, 6, 10, 15, . . .; the square numbers are the numbers
1, 4, 9, 16, 25, . . . The pentagonal numbers 1, 5, 12, 22, 35, . . .. The geometrical language is
justified by the following diagrams:
a. What are the first five hexagonal numbers? What are the first five septagonal numbers?
What are the first five r-gonal numbers? Give a formula for the nth triangular number.
Give a formula for the nth square number. Give a formula for the nth pentagonal number.
In general, give a formula for the nth r-gonal number.
b. How many numbers can you find that are simultaneously triangular and square? How
many numbers can you find that are simultaneously square and pentagonal?
10. The tail of a giant kangaroo is attached by a giant rubber band to a stake in the ground. A

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. algebra

    List all the numbers from the given set that are, a.natural numbers b.whole numbers c.integers d.rational numbers, e.irrational numbers {-9,-4/5,0,0.25,ã3,9.2,ã100}
  2. MATH

    The triangular numbers are the numbers 1, 3, 6, 10, 15, . . .; the square numbers are the numbers 1, 4, 9, 16, 25, . . . The pentagonal numbers 1, 5, 12, 22, 35, . . .. The geometrical language is justified by the following diagrams: …
  3. 9th grade

    Name the set(s) of numbers to which 1.68 belongs. a. rational numbers b. natural numbers, whole numbers, integers, rational numbers c. rational numbers, irrational numbers d. none of the above my answer a)rational numbers
  4. AiMS MATH

    -5 Is A Member Of Which Subset Of Real Numbers. a) natural numbers b) whole numbers c) intergers d) rational numbers e) irrational numbers
  5. Math

    Mark read that the ancient Greeks use to arrange pebbles to represent numbers. He used square on a grid instead of pebbles to model both triangular and square numbers How can you divide a square number into q two triangular numbers?
  6. math

    list all numbers from the given set {-9,-4/5,0,0.25,/3,9.2,/100} that are a) whole numbers b) natural numbers c) intergers d) rational numbers e) irrational numbers.
  7. Algebra

    To which subset of real numbers does the following number belong?
  8. Math

    first five number of: a) Palindromic numbers b) Triangular numbers c) Square numbers
  9. math

    to which subsets of real numbers does the number -22 belong?
  10. Math

    What is the first common number among: palindromic numbers, Triangular numbers and Fibonacci numbers?

More Similar Questions