$45+$18+$26-$21-$93
45+18=63
63+18=81
81+26=107
107-21=86
86-93=-7
<h2>Figure 1: Pyramid.</h2>
Area of the Base: 96
Formula for Base Area: A = L × W
Volume: 640
Formula for Pyramid volume: 
<h2>Figure 2: Triangular Prism</h2>
Area of Base: 80
Formula for Base Area: 1/2 × base side × height
Volume: 960
Formula: 1/2 × B × L × H
Answer: 
Step-by-step explanation:
The picture given in the exercise shows a Quadilateral which has an angle whose measure is unknown.
By definition, the sum of the interior angles of a quadrilateral is 360 degrees.
Knowing this, you can write the following equation:

Finally, you must solve for the angle "x" in order to calculate its measure.
This is:

Answer:
$38.40
Step-by-step explanation:
20% of $48 is 9.60
48- 9.60= 38.40