The midpoint of segment ab is (3,-2). the coordinates of a are (7,-1).
what are the coordinates of b?
a. (-1,-3)
b. (4,-1)
c. (1,3)
d. (-4,1)

the equation for this situation is y=122+45. to solve the equation you would add 45 and 122 to get a total of 167lbs. in conclusion, grace's weight eight weeks ago was 167lbs.  

answer for #1 is c

answer for #2 is d

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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: