Idon't know how to do this i'm so confusing could someone me find these answers. my worksheet says that i can put that there is not enough information but i have to explain what information i would need to solve

David is spreading mulch on a triangular area of his flower bed. the coordinates of the vertices of the area are (1, 3), (9, 3), and (4, 6). what is the area of the triangle if each square has an area of 3 square feet?

How much orange juice do you need to make 2 servings of lemony orange slush?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'