Question

please tell these two questions​

Answer 1

Answer:

Step-by-step explanation:

21x = 66 - 45 the whole sqaure

=441

x = 441/21

=21

Answer 2

2. 21x= (66) ^2 - (45) ^2

a^2 - b^2 = (a-b) (a+b)

21x=(66-45) (66+45)

21x=21*111

21x=2331

x=2331/21

x=111