3c + 5, if c=2
Answer correctly and in PEMDAS

Let's replace "c" with the given value, 2:

3c + 5

3(2) + 5

First, solve the multiplication:

3(2) + 5

6 + 5

Then, the addition:

6 + 5

11

d. 23

Step-by-step explanation:

 x: small hat

 y: medium hat

 z: large hat

 We now write the system of equations:

 x + y + z = 47

 5.50x + 6y + 7z = 302

 -3x + y = 0

 We can write the system in matrix form as:

 Ax = b

 Where,

 A = [1  1  1; 5.50  6  7; -3  1  0]

 b = [47;  302;  0]

 x = [x;  y ;  z]

 Solving the system we have:

 x = 6

 y = 18

 z = 23

hope this helps

correct me if this is wrong