The function a represents the cost of manufacturing product a , in hundreds of dollars , and the function b represents the cost of manufacturing product b , in hundreds of dollars.

Option D is the correct option.

Step-by-step explanation:

The function a represents the cost of manufacturing of product A.

a(t) = 5t + 2

Similarly function b represents the cost of manufacturing of product B.

b(t) = 7t²- 2t + 4

Now we have to find an expression which represents the total cost of manufacturing of product A and B.

a(t) + b(t) = 5t + 2 + 7t² - 2t + 4

              = 7t² + 3t + 6

Answer is function representing manufacturing cost of both the products A and B is Option D. a(t) + b(t) = (7t² + 3t + 6)

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step-by-step explanation:

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this