Gggggggggggggggggggggggggggggggggggggg. It would be 7
(18-7x)+1= -9 Hope this helps ^^
For me personally, the easiest way to do this is by isolating the x² term, and finding the square root of both sides. The hardest way (well actually, the longest way) would be to use the quadratic formula. It just complicates things unnecessarily.
Answer: 60
Step-by-step explanation: 60 because if you do 3×20 You get 60 which is higher than 50 and lower than 100 :)
