What characteristic is true for all relations that are functions?
A. The graph of the relation passes the virtual line test
B. Every x-value in the relation has at least one y-value
C. Every y-value in the relation has exactly one x-value
D. The graph of the relation passes the horizontal line test

step-by-step explanation:

hans did not square the 40-unit side; he merely multiplied it by 2.   incorrect.

the answer is 99.

faster, im not sure why but i know it is faster

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: