Which of the following has four faces

Rewrite the following without an exponent. (5/8)-1

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

The sum of the first eight terms of an arithmetic progression is 9m + 14. the fifth term of the06 progression is 2m - 6, where m is a constant. given that the first term of the progression is 26,find the value of the common difference, d and thevalue of m.