If `4r+7s=23 and r-2s=17` then `3r+3s=`

For any real numbers r and s such that r nes , let r…s be defined by r….s=(r-s)/(r+s) . If r-s=63 and r…s=9 , what is the value of r?

If r^2 - 2rs + s^2 = 4 , then (r - s)^(6) =

If P: Q = 2 : 3 , Q : R = 5 : 7 and R : S = 3 : 10 then P : S = ?

If p : q :r :s = 3 : 4 : 7 : 8 and p+s=55 , then find q + r.

If a /_\ ABC, if r=r_2+r_3-r_1 and /_Agt pi/3 then the range of S/a is equal to (A) (1/2, 2) (B) (1/2,∞) (C) (1/2,3) (D) (3,∞)

If A = {p,q,r, s} and B = {1, 2, 3} , find which of the following is not a function from A to B? A. R_1={(p,1),(q,2),(r,1),(s,2)} B. R_2={(p,1),(q,1),(r,1),(s,1)} C. R_3={(p,1),(q,2),(p,2),(s,3)} D. R_4={(p,2),(q,3),(r,2),(s,2)} ANSWER: C

If S_(r) denotes the sum of the first r terms of an A.P.then show that (S_(3r)-S_(r-1))/(S_(2r)-S_(2r-1)) is equals

If the function r(s) is defined as 2s+3 for all values of s and r(4)=x, what is the value of r(x)?

Velocities of three molecules are 2,3 and 4 m/s. Ratio of mean velocity to R.M.S velocity is

Velocities of three molecules are 2,3 and 4 m/s. Ratio of mean velocity to R.M.S velocity is