Answer:
243 and 394
Step-by-step explanation:
f(x) is the exponential as its values increase by 3 every hour, then
when x = 5
f(5 ) = 81 × 3 = 243
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g(x) is linear as there is a common difference between consecutive values of + 3 , then
when x = 5
g(x) = 391 + 3 = 394
