Answer:

Step-by-step explanation:
The probability of getting one tails is a half.
The probability of getting another tails given you had a tails is:

The probability of getting n tails in general is given by:

So, when we have four tails - our value for n is four.

Answer:
Helen requires 15$ more to buy the three books.
Step-by-step explanation:
We are given the following in the question:
Cost of dictionary = $7
Cost of dinosaur book = $16
Cost of cook book = $17
Helen's allowance = $25
Total cost of three books =

Extra money required to buy three books =

Thus, Helen requires 15$ more to buy the three books.
Answer:
42.3
Step-by-step explanation:
add both angles then subtract by 180 and the negative number is your answer
Answer:
Step-by-step explanation:
I think the quotent is 5, but I recommend waiting for sumone else to answer. Because 31.5 divided by 1.4 equals 22.5 but I'm not sure.