exam Maths Puzzle Numerical Ability

4(1.5c + 6) - 2c = -9

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Please help me with this problem, Thanks.

One common use of positive and negative exponents is in writing numbers as scientific notation. For example 0.000052 can be written as A rectangular storage container with an open top is to have a volume of 10m^3. The length of the base is twice the width. If material for the base costs $10 per square meter and