# maths

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find r from the formula e= ir when e= 20 and i = 4

• maths -

plug in the numbers

so

20=4r

then divide by 4

20/4

so 5=r

• maths -

e= ir

20 = 4r

20/4 = r
5 = r

Substitute 5 for r to prove this equation.

20 = 4 * 5
20 = 20

Right.

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