Question

how does 1/20 + 1/15 equal 8.57

Answer 1

60 is the LCD..

(4 + 3)/60 = 7/60 = 0.1166

should be that...

Answer 2

well... I think they're not equal
\[\LARGE \frac{1}{20}+\frac{1}{15}=8\frac{57}{100}\]
\[\LARGE \frac{3}{60}+\frac{4}{60}=\frac{800}{100}+\frac{57}{100}\]
\[\LARGE \frac{7}{60}=\frac{857}{100}\]

they're not equal !

Answer 3

http://pages.uoregon.edu/dparks/206/resistorvoltage/

Answer 4

can u guys try and figure out what this guy did pls

Answer 5

which task ?

Answer 6

and that's not math, that's physic !

Answer 7

it's 1/R lol..you take the reciprocal :p

Answer 8

1/R = 7/60

R = 60/7
R = what you said

Answer 9

1/Ra=1/20+1/15
Ra=8.57Ω

this one?? :B

Answer 10

yea that one

Answer 11

\[\LARGE \frac{1}{Ra}=\frac{1}{20}+\frac{1}{15}\]
\[\LARGE \frac{1}{Ra}=\frac{7}{60}\]
\[\LARGE 60=7\cdot Ra \quad \quad \Longrightarrow Ra=\frac{60}{7}\]

Ra=8.571428...

Answer 12

lol i see

Answer 13

ok