If angle e measures (7x -12)º, what is the measure of its complement?
a. (7x-192)
b. (102-7x)
c. (192-7x)
d. (7x-102)
i don't know how to solve this! can someone explain it?

A complement angle mean that make with angle E together 90 degrees 

7x-12 + angle complement = 90 

angle complement = 90 -(7x-12)

angle complement = 90 -7x +12

angle complement = 102 -7x 

so choice b. is right sure 

A. p = 2(l + w)p/2 - l = ww = p/2 - l b. while isolating the variable w in the equation, i first divided both sides by 2 and then i subtracted l from both sides. i hope this .

The answer is b: step 2.