Answer: Jessica wants 120 plants in her garden.

Explanation:
Lets find the area of the triangle first:
Tip: the formula can be base x height divided by 2 so you cant get confised about 1/2bh.

Any side of the triangle can be a base, once u find a base, there will always be one corresponding height.

In this case, the base is 12 feet
And the height is 5 feet because that side is perpendicular/corresponding to the base, meaning that the side connects to the base in a 90 degree angle.

So we have this:
12 x 5/2 = 30
The area of the triangle is 30 square feet.

Now, if Jessica wants 4 plants for each square foot of area, we do this:
4 x 30 = 120

Co.mment me if u have any questions
MARK BRAINLIEST PLS TY

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3 years ago