Answer:
25
Step-by-step explanation:
you would use algebra for this
(the unknown value being x)
(19+23+21+X)÷4 = 22 (22 would be the 22 points average)
after solving this equation, your X would be 25, so 25 points
A because you can have a number bigger then 3
The answer must be C. the diagonals of a kite are perpendicular.
Quick note. perpendicular lines always form a 90° angles