Question

Formulas need help will send picutre

Answer 1

In the formula

`(1)/(R)=(1)/(R_1)+(1)/(R_2)+(1)/(R_2)`

putting in the given values of R_1, R_2, and R_3 gives

`(1)/(R)=(1)/(10.0)+(1)/(14.0)+(1)/(35.0)`

We add the fractions on the right-hand- side to get:

`(1)/(R)=(1\cdot7)/(10.0\cdot7)+(1\cdot5)/(14.0\cdot5)+(1\cdot2)/(35.0\cdot2)`
`(1)/(R)=(7)/(70)+(5)/(70)+(2)/(70)`
`(1)/(R)=(14)/(70)=(1)/(5)`

Taking the reciprocal both sides gives

`R=5.0`

Which is our answer!