What answer choice is this and step by step explanation?

2.5/yr

Step-by-step explanation:

Every year the height of the tree goes up by 2.5 ft.

You can tell that by doing this

12-9.5=2.5

9.5-7= 2.5

7-4.5= 2.5

I hope this helps! tell me if I need to explain more!

4 + 5 7/9= 9 7/9

step-by-step explanation:

dilation scale factor 2: starting with δabc, draw the dilation image of the triangle with a center at the origin and a scale factor of two. notice that every coordinate of the original triangle has been multiplied by the scale factor (x2). dilation with scale factor 2, multiply by 2.