Sally’s current grade is a 73% she gets a 60 on her midterm which is worth 20% of her grade. What is final Sally’s grade?

 8 square units

Step-by-step explanation:

The base of the triangle, CD, is 4 times the length of the diagonal of a grid square, so is 4√2. The height of the triangle, EF, is 2 times the length of the diagonal of a grid square, so is 2√2. The area is ...

 A = (1/2)bh

 A = (1/2)(4√2)(2√2) = 8 . . . . square units

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In case you don't know it already, the diagonal of a unit square can be found from the Pythagorean theorem:

 d² = 1² + 1²

 d = √2