Mary is 2 times older than Bob and Bob is 5 years older than Sally. Sally is 10 years old how old is Bob
1 answer:
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Answer:
Step-by-step explanation:
A function and its inverse has the following properties
This implies that;
From the table,
This means that:
Note that: f(7) means the value of f(x) when x=7.
From the table f(x)=-6 when x=7.
That is why f(7)=-6.