Mrs. Doyle was planning a large fund-raiser. She wanted to know what kinds of music to play during the fund-raiser, She surveyed 200 people who were likely to come to the
fund-raiser. She found that Bo of them like to listen to country music. What percent of the
people she surveyed like country music?

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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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:

d. you cannot tell because there are no values shown.