For this case we have the following functions:

We have to:
is given by:

Thus, the correct option is the option is A.
On the other hand,

Thus, the correct option is the option is A.
We also have:

Thus, the correct option is the option is B.
Last we have:

Thus, the correct option is the option is C.
ANswer:
Option A, A, B, C
Answer:
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Answer:
His 55 kg of cement is 5 kg short of the 60 kg he needs.
Step-by-step explanation:
Let r be a ratio useful in determining how much of each ingredient Henry needs:
4/8 of the mix is cement, 3/8 is sand and 1/8 is gravel.
4/8 of the total 120 kg must then be 60 kg made up of cement;
3/8 must then be 45 kg made up of sand; and
1/8 must then be 15 kg made up of gravel
His 55 kg of cement is 5 kg short of the 60 kg he needs.
The answer is C (working shown)
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