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7.5

Step-by-step explanation:

Since the triangles are congruent, corresponding sides will have the same lengths. So since line AC is 7.5, line HT must also be 7.5

found it xd it ok yt

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: