F(n)=f(n-1)+3 such that
f(1)=2

Maria got 21 correct.
Number wrong = Total - Number right
y = 25 - 21
y = 4
Maria got 4 wrong.
Hope this helps!
Answer:
40
Step-by-step explanation:
Calculator.
Answer: 60°
Step-by-step explanation: A straight angle is 180°
180°- 120° = 60°