Ana María had $28,000 to invest. She divided the money into three different accounts. At the end of the year, she had made $1,160 in interest. The annual yield on each of the three accounts was 3.5%, 4.25% and 4.75%. The amount of money in the 4.75% account was 75% of the amount of money in the 3.5% account. Define variables and write systems of equations to represent the situation. Solve the system to determine how much was put into each account.

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step-by-step explanation:

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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: