If a tree is 5ft the year it was planted and grows 4 feet every year how tall is it 1.5 years after it's planted

11 feet tall.

Step-by-step explanation: Since the tree grows 4 feet every year, after one year the tree is 9 feet. After half of another year, the tree would grow half the height (4/2), 2 feet. 9 + 2 = 11 so the tree is 11 feet tall. Consider marking this answer as brainliest if it helped you out.