Question

anwer only the first question​

Answer 1

Question

i] a= 21, b = 18

Answer:

As we know, we have to use this formulae to solve the given question.

$a - ( - b) = a + b$

Let's solve

The solved explanation is in the pic I have given!

Hence, the answer is 39.

Hope it helps you.!

Answer 2

Step-by-step explanation:

Refer to the attachment dear......