What value(s) of x are not in the domain of f(x)= x^3 + 5x divided by 4x?

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

Yesterday, george drank 1 small bottle and 2 large bottles, for a total of 1,372 grams. the day before , he drank 1 small bottle and 1 large bottle, for the total of 858 grams. how many grams does each bottle hold?

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year. the population of her town is changing by a constant rate.true or false?