What is the average rate of change from
x = 10 to x = 15?

50%

Step-by-step explanation:

The original value was increased from 10 to 15, which means it rose by 5.

Now, we find the % change:

increase/original cost times 100

5/10 x 100 = 50%

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x is variable or an unknown value to find

example:

2x = 5 which means x = 3