Question

4. If 4 is the first square number, which is the tenth one?
5. If 3 is the first triangular number, which is the tenth one?​

Answer 1

Step-by-step explanation:

4.

If 4 is the first square number, which is the tenth one?

11^2= 121

2^2, 3^2, 4^2

5.

If 3 is the first triangular number, which is the tenth one?

11×12/2 =66

triangular number is in the form of n×(n+1)//2 where n= 2,3,4,