Which type of transformation could cause a change in the period of a tangent or cotangent function? vertical shift phase shift vertical stretch horizontal stretch

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?

Can someone, me with this.i really need with this

Atransformation was performed on rectangle c as shown in the graph. what type of transformation was performed? does that transformation result in congruent shapes? you people