Answer:
To evaluate the expression a+2bc/3a when a = 4, b = -5, and c = -7, we need to substitute these values into the expression and perform the necessary calculations.
First, we can simplify the expression 2bc as follows:
2bc = 2(-5)(-7) = 70
Next, we can substitute these values into the original expression and perform the necessary calculations:
a+2bc/3a = 4 + 70/3(4)
= 4 + 70/12
= 4 + 5.83
= 9.83
Therefore, the value of the expression a+2bc/3a when a = 4, b = -5, and c = -7 is approximately 9.83.