Final answer:
The value of the expression 0.7g - 2.3h when g = 15 and h = 3 is 3.6.
Step-by-step explanation:
To find the value of the expression 0.7g - 2.3h when g = 15 and h = 3, substitute the given values into the expression.
0.7g - 2.3h = 0.7(15) - 2.3(3) = 10.5 - 6.9 = 3.6.
Therefore, when g = 15 and h = 3, the value of the expression 0.7g - 2.3h is 3.6.