The expression 10x(x² + 9) is equivalent to ax^b+ cx, where a, b, and c are constants. What is the value
of abc ?

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I need it with explanation

When amy exercises in her fitness center for 1 hr she burns a total of 475 calories. if she burns 9 calories a minute jogging on the treadmill and then burns 6.5 calories a minute pedaling on the stationary bicycle how many minutes of the hour does she spend exercising on the bicycle?