exam Maths Puzzle Numerical Ability

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

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exam Other Question

3x^2-6x=3
Not sure if I am doing this right, but so far I have
3x^2-6x-3=0
x^2-3x-1=0
Am I on the right track?
Can you help me with the rest?
Thanks so much!
ac The right cone has the h = 4 cm and r = 3 cm, what is the volume?