What do you need to do before you can add the fraction

If R is the total resistance for a parallel circuit with two resistors of resistances of r1 and r2 then 1/r=1/r1+1/r2 find the resistance r1 if the total resistance is 20 ohms and r2 is 75 ohms round your answer to the nearest ohms if neccesary a.

What is the result of 4 divided by one-half? A number line going from 0 to 4. 2 8 12 16

Georgia makes $20 doing lawn work for four hours each week he wants to buy a $2500 use car he has been saving this money 430 weeks how much has he saved

How to find the product of (3y^2 + 2y + 2) (3y^2 - 4y - 5)

Does 5x^2 + y = 5 represent y as a function of x?

He statement below describes a situation in which opposite quantities combine to make 0. Is the statement true or false? A diver descends to the shipwreck and, after he is done exploring, returns to the surface of the water. A. true? B. false?

1.) What is the solution to the system of equations below? y = 2x + 8 3 (-2x + y) = 19

Alba travels between the two mile markers shown and then finds her average speed in miles per hour. Select the three equations that represent this situation.

I am stuck on this problem and I do not know what to do

How to i do 7/16: (31/2:1/2)