So,two angles in a triangle add up to 115 degrees.what is the size of the third angle?

Since it is 115, the size of the third angle would be 75 degrees. 

A triangle has a sum of 180 degrees.
If two of the three angles sum up to 115, then the third angle would be 180-115 which would equal out too 75 degrees.

Let’s call the tree in which is growing at a rate of 1 foot per year Tree A, and the tree growing 0.5 feet a year Tree B. In 2 years Tree A will be 7 feet high. Tree B, in two years will be 7 feet, because .5 x 2 is equal to 1 foot. Therefore making Tree B 7 feet.

ANSWER:
In two years Tree A (1 foot per year), and Tree B (0.5 feet per year) will grow to 7 feet.

Hope this helped. Have a great day. And a thank you or brainliest is very appreciated.