Me asap with a function percent problem, giving double 12 points! i think my answer might be wrong

Which transformations could have occurred to map △abc to △a"b"c"? a rotation and a reflection a translation and a dilation a reflection and a dilation a dilation and a rotation

Does the point (1, sqrt 7) lie on circle shown.

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?