The area of the circle is given as:

Plugging the value of the radius we have that:

Therefore the area in terms of pi is:

Maria got 21 correct.
Number wrong = Total - Number right
y = 25 - 21
y = 4
Maria got 4 wrong.
Hope this helps!
Easy first cover kilograms into grams 1kg=1000g. resulting in 10,000g dividing that by the weight of the oranges getting 10,000/200=50 so the answer is 50 oranges. (assuming they all weigh the same)
I'll try to understand this but I don't really get it because I'm in middle school