A is the correct answer. Please give me brainliest
Answer:
512
Step-by-step explanation:
the number of subsets of the set {1, 2, 3, ..., 9} is : 2^9 = 512
You can change the denominators so they are alike.

Not sure how there can be two possible answers unless you're mentioning the decimal form:
.775
Tell me if this helps!!
The area of a triangle is base length x height then divide all by 2,
so 12 x 10 /2
=60 ft²