Answer:
Might be
Step-by-step explanation:
A.) The probability of all dependent events can be calculated using the OR formula

Hey there! Our goal here is to isolate the variable on one side of the equation.

Tony’s backpack can carry weight up to 22 but not more that that
If the variable n represents the total weight carried by tony
Then ; n less than or equal to (n=1+3+3b
=4+3b
Where b represents book
4+3b is less or equal to 22
3b is less or equal to 18
b is less or equal to 6
Therefore Tony’s backpack cannot carry more than 6 books
Cos=21/35
=0.6
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