Question

Please answer I don't have too much time!!!​

Answer 1

Answer:

a 5

b 3

c 10

d 2

Step-by-step explanation:

The Triangular Number Sequence is 1, 3, 6, 10, 15, 21, 28, 36, 45, 55

a . 4th +5th = 10+15=25

which is the square root of  5

b. 2nd +3rd = 3+6=9

which is the square root of  3

c . 9th+10th = 45+55 =100

which is the square root of 10

d 1st+2nd =1+3 =4

which is the square root of 2