Question 21
A binary operation $\Delta $is defined by $a\Delta b=a+b+1$for any real number a and b, Find the inverse of the real number 7 under the operation$\Delta $, if the identity element is -1

A binary operation $\oplus $ on real numbers is defined by $x\oplus y=xy+x+y$for any two real numbers x and y . The value of $(-\tfrac{3}{4})\oplus 6$ is

Find the sum to infinity of the series $2+\tfrac{3}{2}+\tfrac{9}{8}+\tfrac{27}{32}+---$

The n^th term of the sequence $\tfrac{3}{2},3,7,16,35,74,-,-,-$ is

The solution of the quadratic inequality is $({{x}^{2}}+x-12)\ge 0$is

$W\propto {{L}^{2}}$and W = 6 and L = 4, if L = $\sqrt{17}$, find W

The graph above is represented by

Factorize $2{{t}^{2}}+t-15$

Make l  the subject of the formula $d=\sqrt{\frac{42w}{5l}}$