To find your answer you would divide 21 by 3 which would be 7, once you've got 7 you would multiply it by 9 which would give you the amount of old houses that there is which would be 63.
Since they are independent events to find the probability of both is P(A) * P(B)
P(A) = P(Heads) =

P(B) = P(Roll ≥ 4) =

Now multiply those fractions together

= P(Heads & ≥ 4)
Answer:
10/12
15/16
13/16
Step-by-step explanation:
each time you divide each of these they are over .5 or 50%
Answer:
900 calories
Step-by-step explanation:
each cracker has 5 calories so you would times 5 by 180 which gets you 900