Answer:
r is the variable, r=30
Step-by-step explanation:
A variable is a quantity that may change within the context of a mathematical problem or experiment. Typically, we use a single letter to represent a variable. The letters x, y, and z are common generic symbols used for variables.
-4+r=26
4+26=30
r+30
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The answer is the option A, which is: A. x-7=x²+2x-4
The explanation is shown below:
To solve this problem you must apply the proccedure shown below:
1. You have the following system equations given in the problem above:
<span>y=x-7
y=x²+2x-4
2. Therefore, when you substitute for y in the bottom equation, you obtain:
</span>x-7=x²+2x-4
2/2 part of the equation is ≤ B
maybe 30/100 ≤ B
Paul spend 22.4 on student discount card.
