Question

Answer both questions with explanation . it is soo urgent

Answer 1

Answer:

,$1^{2}=1\\ 2^{2=4}\\ 3^{2}=9\\ ?^{2}=16 =>?=4 \\5^{2}=25 \\6^{2}=36\\ 7^{2}=49\\ 8^{2}=64 \\ 9^{2}=81$

1. There are 19 9s in between 1 to 100. 9,19,29,39,49,59,69,79,89,90,91,92,93,94,95,96,97,98,99.

Step-by-step explanation: