Events a and b are mutually exclusive. also, p(a) = 0.25 and p(b) = 0.35. what is p(a or b)?

a.0.1
b.0.25
c.0.35
d.0.6

The answer is D. 0.6

P(A or B) = P(A) + P(B) - P(A and B)
When the events are mutually exclusive, that means they cannot occur together:
P(A and B) is empty set, thus = 0
P(A) = 0.25
P(B) = 0.35
P(A or B) = 0.25 + 0.35 - 0 = 0.6

4+2=-2. 1+2=3. y=-2/3x+b. 2=4/3+b. 2/3=b. the answer is y= -2/3x+2/3