exam Maths Puzzle Numerical Ability

Factor completely.
49x^2 - 9

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exam Other Question

Subtract:
6p - w __ 4c + p
w - 4 w - 4 Can someone help me on this problem?

I need to somve the following application:

The electricity costs of a business decreased from $12,000 one year to $10,920 the next. What is the rate of decrease?

Thanks, Lyn