Amy does a weekly exercise program consisting of cardiovascular work and weight training. Each week, she exercises for at least 9 hours. She spends at most 12 hours on weight training. She spends at most 7 hours doing cardiovascular work. Let x denote the time (in hours) that amy spends doing cardiovascular work. Let y denote the time (in hours) that she spends weight training.

it would be 6xy and -16xy.

explanation:

infrared radiation has wavelength in the range between 700 nm and 1 mm. lets' convert these values into scientific notation, keeping in mind that:

let's start from the lower value, we have:

(we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)

the higher value is:

so, the range of wavelength of infrared radiation is:

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the answer is d

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