Rechel needs a mixture of nuts containing peanuts and cashews of 46 pounds.
This means that the sum of peanuts and cashews must be equal to 46 pounds.
Let p denotes the number of pounds of peanuts.
Let c denotes the number of pounds of cashews.
Then we can write the following equation
![c+p=46](https://img.qammunity.org/2023/formulas/mathematics/college/o20bet6q8irmmhktjgno4vhkz0gyyk4d5o.png)
Let us make c the subject of the equation
![c=46-p](https://img.qammunity.org/2023/formulas/mathematics/college/dngebvtaaas3i4lghq2xh9pmsd02bcivfq.png)
Therefore, the expression for the number of pounds of cashews that Rachel needs to add is 46 - p
![46-p](https://img.qammunity.org/2023/formulas/mathematics/college/htovuq9b2mlsjcmulx1vp1zpiqkhk1qu69.png)