Recent content by SD43

I did what you said 1/20 + 1/4 + 1/6 ^ -1 = 2,14 2,14 + 9 = 11,14 1/11,14 + 1/12 ^ -1 = 5,77 5,77 + 4 = 9,77! Wow thanks! So do any of you know sites where I can practice these sort of questions because I'm getting a final test for physics about this the law of Archimedes, pressure and...

I'm sorry, but I keep getting 9,8 as the answer without any variables behind it. So what I do is 12 + 8 = 20 1/20 + 1/6 + 1/4 + 9 = 9,46666667 9,46666667 + 1/12 + 1/4 = 9,8 Though it's close it's still completely false. What am I doing wrong?

Thank you, I never knew I could save images as JPG. Anyway I attached the file and it's oddly enough only 9,7 Kb.

Homework Statement I need to calculate the replacement resistance Rv (Ohm) of the following R1 = 12 ohm R2 = 8 ohm R3 = 6 ohm R4 = 4 ohm R5 = 9 ohm R6 = 12 ohm R7 = 4 ohm I've been trying to include a picture that I've drawn in paint but apparently a couple of lines exceeds the...