Find the value of -
`8 9/13 + 8/9`

Find the value of ( 8^-1 - 9^-1 )^-1 ÷ ( 4^-1 - 9^-1 )^-1

Find the value of   (8! )/( 9! - 5! ) is

If in the following series, a_(1)=5, a_(2)= 9, a_(3)=13 and so on, then find the value of a_(8), 5, 9, 13, …, a_(8)

If 3 ( 5x - 7) - 4 ( 8x - 13) = 2 ( 9x - 11) - 17, then the value of ( 7x - 5)/(11 x - 9) is

Find the value of p if (14p-4): (8p-1) = (3p+8): (9p+5) -

Find the value of if the mean of the following distribution is 7.5. 3 5 7 9 11 13 6 8 15 8 4

Find the value of tan^(-1) (-tan.(13pi)/(8)) + cot^(-1) (-cot((9pi)/(8)))