Which of the following can be the coordinates of if angle qrs is an isosceles triangle?

The answer is : A (-a,0)
It can't be 'b' as it is on y-axis.

So we are left with A.
On the x-axis, y=0. And x is -a as 'a' is a x-coordinate.

Hope it helped!!

1.   an exact solution requires a radical solution - no decimal approximation.2. (a)4x^3 = 756x^3 = 756/4 = 189x =   cube root of 189 =   5.74   to nearest hundredth answer(b)   189 = 3*3*3*7   so we can write the cube root of 189 as 3∛7 answerchecking (a) 4*(5.74^3 =   756.48   which is very close(b)   4* ((3∛3)^3   = 4*189   = 756   - spot on! 3. i would use solution b because the original question asked for an exact solution.