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C: 10 - x = 5

Step-by-step explanation:

10 - x = 5

-10 -10

-x = -5

-x/-1 = x -5/-1 = 5

x = 5

f(3 + 4)

Step-by-step explanation:

Since they are exponents...,

If f(x) = a^xthen substitute as given,

; f(3) = a^3

; f(4) = a^4

Hence as the question states

f(3).f(4) = a^3 × a^4

; If the values are of the same base...,

then we add the exponents if the question is of multiplication

; a^3+4in which our new x = (3 + 4)

;Which is the one that we substitute onto the value of x in f(x)

Hence answer... f(3 + 4)