Answer:
It will cost Alex $52.5 to make 12 pennants
Step-by-step explanation:
The area of the pennant is the area of the rectangular portion plus the area of the triangular portion.
[tex]=1\times 3 +\frac{1}{2}\times 1\times 1[/tex]
[tex]Area=3+\frac{1}{2} ft^2[/tex]
[tex]Area=3.5 ft^2[/tex]
The area of 12 pennants
[tex]=12\times 3.5ft^2[/tex]
[tex]=42ft^2[/tex]
If the fabric for the pennants costs $1.25 per square foot, then;
42 square feet will cost [tex]1.25\times 42=52.5[/tex] dollars.
