An expression is defined as a set of numbers, variables, and mathematical operations. The expression that can represent the total income of Sheryl is 7e+13n.
<h3>What is an Expression?</h3>
In mathematics, an expression is defined as a set of numbers, variables, and mathematical operations formed according to rules dependent on the context. 
Since Sheryl makes $7 per pair of earrings and $13 per necklace, therefore, the expression that can represent her total income of Sheryl is 7e+13n.
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Answer:
The answer is (-3,7/2)
Step-by-step explanation:

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Answer:
 Cost of one pencil: 
 Cost of one eraser: 
Step-by-step explanation:
 Let be "p" the cost in dollars of one pencil and "e" the cost in dollars of one eraser.
 Based on the information given in the exercise, you can set up the following system of equations:
 
 You can use the Elimination Method to solve the system of equations.
 Multiply the first equation by -3 ad the second one by 4. Then add the equations and solve for "e":
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 Substitute the value of "e" into any original equation  and solve for "p":
 
 
        
             
        
        
        
Answer:
73
Step-by-step explanation:
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