Find `a^- 2 ,if a=((- 5)/9)^(- 5)-:(21/25)^0`

Find: 0.5-:0.25

Find : (5/9)^(-2) times ( 9/5 )^(-3) times ( 3/5 )^0

Find the 25th term of the AP -5, (-5)/(2), 0, (5)/(2),….

Find: 0.5 div 0.25

Find the sum : (i) 5/4 + ((-11)/(4)) , (ii) 5/3 + 3/5 , (iii) (-9)/(10) + 22/15 (iv) (-3)/(-11) + 5/9 , (v) (-8)/(19) + ((-2))/(57) , (vi) (-2)/(3) + 0 (vii) -2'1/3 + 4'3/5

Find the value of 2.5^2 + 2 ( 2.5 ) ( 7.5 ) + 7.5^2

Find: 3.25-:0.5