Answer:
Option a.
Step-by-step explanation:
You have the following limit:
The method of direct substitution consists of substituting the value of in the function and simplifying the expression obtained.
We then use this method to solve the limit by doing
Therefore:
By definition, any number raised to exponent 0 is equal to 1
So
Finally
The cost of 1kg of coal mined from the ore is $0.0397
Data;
To find the cost of 1kg of coal, we can simply and equate 1 ton to its equivalent in ton and the solve.
let's write this and equate it
1 ton = $35.99
907kg = $35.99
1kg = x
Let's cross multiply both sides and solve for x
The cost of 1kg of coal is $0.0397
Learn more on proportions here;