Janice can type 250 words in 5 minutes while Jon can type 150 words in 3.5 minutes is it proportional

No they are not proportional

Step-by-step explanation:

250/5 = 150/3.5

50 ≠ 42.857..

Part A) − 12 b  +  6 c  +  18

Part B) -2b + 1c + 3

Part C) -4

Step-by-step explanation:

Part A)

Step 1:

-4b + -8b = -12b

Step 2:

8c + 2c = 6c

Step 3:

12 + 6 = 18

− 12 b  +  6 c  +  18

Part B)

GCF = 6

Step 1:

-12 divided by 6 = -2b

Step 2:

6 divided by 6 = 1c

Step 3:

18 divide by 6 = 3

-2b + 1c + 3

Part C)

Step 1: Subsitute 2 for b and 3 for c

(− 2 x 2 )  +  (1  x -3) +  3

Step 2: Multiply (− 2 x 2 )  +  (1  x -3) +  3

-4 + (-3) + 3

Step 2: Add -4 + (-3) + 3

-7 + 3 = -4

-4