1). Evaluate:
a) 3
/7
+ (−4
/9
) + (−11
/7
) +
7
/9

b) [1/2 ÷ (−1/3)] ÷ 2/5

2). Find the value of:

a) 2
^-3 ÷ 2^-12

b) { 1
/2
}
^-2 + { 1
/3
}
^-2 + { 1
/5
}
^-2

3). The length and breadth of a rectangular field are 11
3
/7
m and 7
1
/5
m

respectively. What is the approximate measurement of perimeter of the

rectangular field?

4). What will be the unit digit in the square of the following numbers?
a) 789
b) 397
5). Without adding, find the sum: 1+3+5+7+9+11+13+15+17+19

10. If 3^x+8 = 27^2x then, find the value of x.​