SOLUTION: Can you please help me!! I am so lost with these two. Thanks! Fungicides account for one tenth of the pesticides used in the United States. Insecticides account for one fourth o

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Question 116980: Can you please help me!! I am so lost with these two. Thanks!
Fungicides account for one tenth of the pesticides used in the United States. Insecticides account for one fourth of all the pesticides used in the United
States. The ratio of fungicides to insecticides used in the United States can be written as one tenth divided by one fourth. Write this ratio in simplest form.



The combined resistance of two resistors R1 and R2 in a parallel circuit is given by the formula RT = 1 over 1r1 + 1r2.Simplify the formula.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Fungicides account for one tenth of the pesticides used in the United States.
Insecticides account for one fourth of all the pesticides used in the United
States. The ratio of fungicides to insecticides used in the United States can be
written as one tenth divided by one fourth. Write this ratio in simplest form.
:
Here's what it says:
1%2F10 / 1%2F4
When you divide fractions you:
"Invert the dividing fraction and multiply"
1%2F10 * 4%2F1 = 4%2F10 = 2%2F5
:
:
The combined resistance of two resistors R1 and R2 in a parallel circuit is
given by the formula RT = 1 over 1r1 + 1r2. Simplify the formula.
:
I think you mean:
Rt = 1%2F%28%281%2Fr1%29+%2B+%281%2Fr2%29%29
:
Change the denominator portion to be a single fraction over a common denominator
%28%281%2Fr1%29+%2B+%281%2Fr2%29%29 = %28r2+%2B+r1%29%2F%28r1%2Ar2%29
:
This is divided into 1 which just consists of inverting the dividing fraction, so we have;
%28r1%2Ar2%29%2F%28r2+%2B+r1%29; the old "product over sum" formula for two resistors in parallell
:
:
Did this help you find your way, somewhat?