Question

comic books cost $2 each and magazines cost $4 each. if you want to spend exactly $30 and you buy 3 magazines, how many comic books can you buy? youre trying to figure out how many comic books you can buy if you buy 3 magazines, and want to spend exactly $30. m represents the number of magazines, so start by substituting 3 for m in the equation. $2c + 4m = 30$ $2c + 4 cdot square = 30$

Explanation:

Step1: Substitute m=3 into equation

$2c + 4 \cdot 3 = 30$

Step2: Calculate 4 times 3

$2c + 12 = 30$

Step3: Subtract 12 from both sides

$2c = 30 - 12$
$2c = 18$

Step4: Solve for c (divide by 2)

$c = \frac{18}{2}$
$c = 9$

Answer:

The missing value in the box is 3, and you can buy 9 comic books.