B. A candle is lit and burns at a constant rate of change until it is completely burned. When the candle has been burning for 3.3 hours it is 13.9 inches tall and when it has been burning for 7.2 hours it is
4.2 inches tall. At what constant rate did the candle burn?

For the first question the answer is a, for the second c, for the third d, for the 4th b, for the 5th a

1.   an exact solution requires a radical solution - no decimal approximation.2. (a)4x^3 = 756x^3 = 756/4 = 189x =   cube root of 189 =   5.74   to nearest hundredth answer(b)   189 = 3*3*3*7   so we can write the cube root of 189 as 3∛7 answerchecking (a) 4*(5.74^3 =   756.48   which is very close(b)   4* ((3∛3)^3   = 4*189   = 756   - spot on! 3. i would use solution b because the original question asked for an exact solution.