Can u me. plz o plz o plz math 5 points

What is the missing reason in step 5? linear pair postulategivendefinition of complementary anglescongruent complements theorem

Events a and b are independent. the probability of a occurring is 2/5. the probability of b occurring is 1/4. what is p(a and b)?

X^2/100+y^2/25=1 the y-intercepts are at: a) (-10,0) and (10,0) b) (0,10) and (0,5) c) (0,-5) and (0,5)