7/60
47(mod 5)
An advertising company estimates that the cost of poster printing will be $200 for the printing equipment, plus $3 per poster prin...
In a class of 28 student, 12 students play tennis ,15 students play footbaall, 8 students play neither footbal nor tennis and x pl...
3x^2-15= o
x^2+2x-1=0
x^2+2x-1>0
x^2-2x-x+3x+6+3x^2+6+4x-8-x
3x*x
8(x^2)-27x-9
8x-2y-3z=720
-12x+22.8y-9z=0
34x-43y+21z=0
