Question

1. find the area:

Explanation:

Step1: Recall trapezoid area formula

The formula for the area of a trapezoid is $A=\frac{(b_1 + b_2)h}{2}$, where $b_1$ and $b_2$ are the lengths of the parallel - sides and $h$ is the height.

Step2: Identify values

Here, $b_1 = 5$ ft, $b_2=7$ ft, and $h = 4$ ft.

Step3: Substitute values into formula

$A=\frac{(5 + 7)\times4}{2}$.
First, calculate the sum of the parallel - sides: $5+7 = 12$ ft.
Then, multiply by the height: $12\times4=48$ square - feet.
Finally, divide by 2: $\frac{48}{2}=24$ square - feet.

Answer:

$24$ square feet