Um, I'd say discrete because it's not important. I'd never say it's continuous.
Step-by-step
=> 900=-100x+300
=> -100x+300=900
=> -100x=900–300
=> -100x=600 divide both side by -100
=> x=-6
Hey there!!
25 is the answer
Hope this helps. c:
X/4 = -9
x/4 = -9/1
cross multiply
x = -36
