Complete the mapping of the vertices of ΔDEF. D(2, –4) → D'
✔ (-4, 2)
E(1, –1) → E'
✔ (-1, 1)
F(5, 1) → F'
✔ (1, 5)
What is the rule that describes a reflection across the line y = x?

rx = y(x, y) →
✔ (y, x)

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: