X+ 78 = 80 what does "x" equal? explain !

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

What is true about the dilation? it is a reduction with a scale factor between 0 and 1. it is a reduction with a scale factor greater than 1. it is an enlargement with a scale factor between 0 and 1. it is an enlargement with a scale factor greater than 1.

Write an equation for the function that includes the points (1,4/5) and (2,2/3)