Answer:
1) 2.6 ft³
Explanation:
for the first one, multiply height times width times depth divided by two, since it is a triangle. Area of a triangle is always height times width divided by two.
So
(1.3 × 1 × 4)/2 = 2.6 ft³
The second one you can see as 6 of those triangle bars glued together, can you calculate the volume then?