500x3=1500
80x3=240
4x3=12
1500+240+12=1,752
0.3(4x-8)-0.5(2.4x+4)
1.2x-2.4-1.2x+2
x-0.4
When given the scale factor, just multiply!
8cm * 2.5 = 20cm per side
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The four items that were on sale? Sorry I need more info in order to help.
