Answer:
Let's substitute the given values into the expression:
-2B + 3C
Given that:
a = -2
B = 3
C = 4.2
Substitute these values into the expression:
-2(3) + 3(4.2)
Now perform the calculations:
-6 + 12.6 = 6.6
So, the result of the expression -2B + 3C, when a = -2, B = 3, and C = 4.2, is 6.6.