The points (80,20) and (120,30) form a proportional relationship. What is the slope of the line that passes through these points A. 1/4
B. 4
C. 10
D. 40

Step-by-step explanation:

Slope = where the given points are and

Plug the given points (80,20) and (120,30) into the equation

Therefore, the slope of the line that passes through these points is .

I hope this helps!

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:

answer: #1 ads up by 8 and i don't know #2