book Maths Puzzle Numerical Ability

How does the problem (3x to the fourth power y to the third power)(4x to the fourth power y) work.

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Could you please show me all steps to solve the following:

This year Jenny is twice as old as Bev. Next year the sum of their ages will be 50. A third friend Rachel is three qua
what is the slope of the line whose equation is 4x+5y=10
I think that the answer is -4/5
Is that right?
Thanks you so much for helping me! I really appreciate it.