Add the expressions:
(i) pq −1 and 3pq + 2
(ii) 8x + 3 and 1 − 7x

Subtract:
i) 7pq from 11pq
ii) – a from a
iii) 5x + 7 from 21x + 9

Simplify:100x + 99y – 98z + 10x + 10y + 10z – x – y + z

i) Add: 3x − 4y + z and 2x − z + 3y
ii) Subtract 2x − 5y from 4x + 3y

Rani earns Rs.200 on the first day and spends some amount in the evening. She earns Rs.300 on the second day and spends double the amount as she spents on the first day. She earns Rs.400 on the third day and spends 4 times the amount as she spents on the first day. Can you give an algebraic expression of the total amount with her, at the end of the third day.