What is `10^(-10)` equal to?

The solubility product of SrF_(2) in water is 8xx10^(-10) Calculate its solubility in 0.1 M of aqueous NaF solution. If its solubility is expressed as y xx 10^(-8) then what is the value of 'y' ?

What is 10% law ?

The value of cos ^(2) 10^(@) - cos 10^(@) cos 50^(@) + cos ^(2) 50^(@) is equal to

The value of cos ^(2) 10^(@) cos 50^(@) + cos ^(2) 50^(@) is equal to

The value of ""^(40) C_(31) + sum _(r = 0)^(10) ""^(40 + r) C_(10 +r) is equal to