Write a single algebraic term to represent the expression a+a+a

Antonio made a scale model of a building. the model's scale is 1 inch to 235 feet and its height is 3.5 inches. what is the exact height of the actual building? enter your answer in the box.

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

Find the midpoint m of z1=(8+5i) and z2=(12+3i)