Answer:
x = 27
y = 29
Step-by-step explanation:
25/100=30/x x=120 (30+70y)/(120+100y)=50/100 100y=?
Answer:
728
Step-by-step explanation:
2+6+18+...+486
a=2
r=6/2=3

Try subtracting first there were 10 then four were sold I don't know what happens after but thats what I know
Add like terms
I'm assuming that you forgot to put the parenthasees at the end
so exg
4x+8x=12x
2x^2+3x^2=5x^2
3x^2+3x^3=3x^2+3x^3
group like tems
6x^3+9x-8+5x-9x^2+7
6x^3-9x^2+14x-1