sir yha pr kya kiya h

1. The marks obtained (out of 100) by a class  of 80 students are given below: 
   

If tan2A=cot(A-18 degree) then find the value of A Where 2A is an acute angle

Sum of present ages of and swati is 31.Manish's age 3 years ago was 4 times the age of savita. Find their ages

How to solve semicircle and what is it 

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considered the following distributions of daily wges of 50 workers of a factory

(x+y^2)+2(2y^2+y+x-1)y'=0

Can anyone here help me please?

Thanks a lot <3 <3 <3

Two line cut the axis of x at distances of4and -4and axis of y at distances of2and 6 resprectal find the coordinate of  their point of intersaction

1. 200 logs are stacked in the following manner 20 logs in the bottom row 19 in the second and so on. In how many rows the 200 logs placed?

1. How to find LCM