Answer:
4a + 5t + 9
Explanation:
Algebraic expressions:
Perimeter of the quadrilateral is sum of all the sides.
a + 2t + 3t + 3a + 4 + 5 = a + 3a + 2t + 3t + 4 + 5
Combine like terms. Like terms have same variable with same powers.
a and 3a & 2t and 5t are like terms. 4 and 5 are constants.
= 4a + 5t + 9