Find the value of p= 3a + 4b - 6c when a=2 b=3 and c=-1
got exam soon and don't know how to complete these..

Simply make the substitution.

P = 3a + 4b -6c                a=2, b=3, c=-1.

P = 3*(2) + 4*(3) - 6*(-1)          Multiply out.

P = 6 +12 +6 = 24.

P = 24.

Happy exams.

Oh this is easy! Basically you use substitution - so you put in the numbers into the letters:

P = 3a + 4b -6c a = 2 b = 3 and c = -1
(PUT NUMBERS INTO LETTERS)
P = 3(2) + 4(3) - 6(-1)
P = (3x2) + (4x3) -(6x-1)
P = 6 + 12 + 6
P = 24