Can someone please help? will give brainlest!

Step-by-step explanation:

Rounding to nearest tenth:

i) if number in 100th place is 5,6,7,8 or 9, then add 1 to number in the tenth place and after adding remove all the digits right to it.

EG: 4.567  = 4.6

ii) if number in 100th place is 0,1,2,3 or 4, then write down number in the tenth place as it is and then remove all the digits right to it.

Eg: 4.523 = 4.5

a) 0.32 = 0.3  (b) 3.87 = 3.9   (c)0.709 = 0.7

d) 12.75 = 12.8  (d)12.745 = 12.8   e) 645.059 = 645.1

use formula for the circle a=3.14

step-by-step explanation:

the answer will be