Problem ID: PRABETQG if you paid 49.77 for a 42 dollor meal, How much was the tip as a percentage of the bill? ​

20%

step-by-step explanation:

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:

- (2, -7)

- lines r and s and lines t and u must be parallel