ICSE − Q & A

In banking, 
1)For eg., should 565 be rounded off to 560 or 570?
2) When we get the interest ( final and.) should we remove the decimal part??

Guys instead of improving my performance is  impairing guys please share some tips to overcome this.
From 78 to 72.5.

Is it important to write the steps for construction question??

http://www.respaper.com/icse_prelims/358/876/3594-pdf.html Q1(c)
is 40.50 decrease correct?

If A={x:-1<x<7,x belongs to R} and B={x:1<x<5,x belongs to I},
If hey ask us to plot A intersection B' then wont it include all real no.s between the integers 2 and 4(which belong to B)?How do we plot it then on the no. line?

one question please do answer, in sums of trigonometry such as find dis. btw 2 ships when height of cliff is given and the angle facing the cliff is given as 32.20 degree
then to find the base we need to divide the h of cliff by tan 32.20 so instead can we consider the consider the complementary angle so only we would have to multiply the h you may ask me to use cot instead but i don't think so cot values are given in the clarke's book

http://www.respaper.com/padmanabh30/9936-pdf.html in q.10b will the month of april have zero balance??

How do we round off numbers to significant figures?Especially if a number contains 0.
Please explain with examples.
Thanks in advance

Selina Revision paper 4
Q  1)b...
$olution plz

Will they reduce marks if i didn't write theta next to sin or any other trigonometric expression???????????????????