Please help
Me I don’t know the answers pleasee

12

Step-by-step explanation:

First, replace x and y with 3 and 4. Your equation set-up should be 7(3)-2(4)-1. Now, we can solve

7(3)-2(4)-1=?

21-8-1=?

13-1=?

12=?

Your answer is 12. Hope this helps!

c - they will have the same distribution

step-by-step explanation:

this is the only one that could make sense. : )

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: