merihan
merihan merihan
  • 21-05-2020
  • Mathematics
contestada

.. List the 15th
and 19th
triangular numbers.​

Respuesta :

PollyP52 PollyP52
  • 21-05-2020

Answer:

See below in bold.

Step-by-step explanation:

The formula is Tn = n(n + 1) / 2

The first triangular number is 1(1+1) / 2 = 2/2 = 1.

So the 15th = 15(15+1) / 2 = 120.

and the 19th = (19 * 20) / 2 = 190.

Answer Link

Otras preguntas

For a school project, Leonis making a model of the staue of liberty. He is using a scale of 2 cm : 3 m. The Statue of Liberty is 93 meters tall. How yall is Leo
help i need it baldy >)
on october 25, yacht doc received $200,000 for a yacht valued at $180,000 and a 4-month service contract. during november, the yacht was delivered and 1 month o
How many can fit in the rectangle
If 200 is added to a positive integer I, the result is a square number. If 276 is added to to the same integer I, another square number is obtained. Find I.
Why was the universal declaration of human rights was created?
The picture explains it
Find the volume of the cone.9 cmr= 6 cmV = [?] cm3
Point L is the center of the circle. How many chords are shown?4N3O5MR2QР
Find the number that makes the ratio equivalent to 88:36. ___:9Need help finding ratio