Answer:
504km/h
Step-by-step explanation:
there are 60 minutes in an hour.
8.4kmx60min= 504km/h
I just copied and pasted your question on google and a graph came up it may not be the answer but i tried...
Let numbers of books be 'b' and numbers of CDs be 'c'
We can set up two equations:
Equation [1] ⇒

Equation [2] ⇒

We are solving for the number of books and the number of CDs bought
When we have two equations in terms of two different variables;

and

, that we need to solve, then this becomes a simultaneous equation problem.
First, rearrange Equation [1] to make either

or

the subject:


Then we substitute

into Equation [2]






Now we know the value of

which is

, substitute this value into

we have

Answer:
Numbers of books = 13
Numbers of CDs = 7
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Answer:
-12x²-48x-42.5
Step-by-step explanation: