math
posted by jeep .
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 rgonal 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 rgonal 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
Similar Questions

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} 
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: … 
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 
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 
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? 
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. 
Algebra
To which subset of real numbers does the following number belong? 
Math
first five number of: a) Palindromic numbers b) Triangular numbers c) Square numbers 
math
to which subsets of real numbers does the number 22 belong? 
Math
What is the first common number among: palindromic numbers, Triangular numbers and Fibonacci numbers?