We are asked to solve four problems: a. Add the decimal numbers 1.2, 3.45, and 23.6. b. Add the decimal numbers 4.5, 0.51, 6, and 12.4. c. Calculate the perimeter of a rectangle with sides 0.6 m and 0.4 m. d. Find the difference between the time Mathea took to run 50 meters (8.52 seconds) and the time Drew took to run 50 meters (8.46 seconds).

1. Problem Description

We are asked to solve four problems:

a. Add the decimal numbers 1.2, 3.45, and 23.

6. b. Add the decimal numbers 4.5, 0.51, 6, and 12.

4. c. Calculate the perimeter of a rectangle with sides 0.6 m and 0.4 m.

d. Find the difference between the time Mathea took to run 50 meters (8.52 seconds) and the time Drew took to run 50 meters (8.46 seconds).

2. Solution Steps

a. Adding 1.2, 3.45, and 23.6:

$1.2 + 3.45 + 23.6 = 1.20 + 3.45 + 23.60 = 28.25$

b. Adding 4.5, 0.51, 6, and 12.4:

$4.5 + 0.51 + 6 + 12.4 = 4.50 + 0.51 + 6.00 + 12.40 = 23.41$

c. Calculating the perimeter of the rectangle:

The formula for the perimeter of a rectangle is:

$P = 2 * (length + width)$

In this case, length = 0.6 m and width = 0.4 m.

$P = 2 * (0.6 + 0.4) = 2 * (1) = 2$ m

d. Finding the difference in running times:

We need to find how many seconds faster Drew ran than Mathea.

Drew's time = 8.46 seconds

Mathea's time = 8.52 seconds

Difference = Mathea's time - Drew's time

Difference = $8.52 - 8.46 = 0.06$ seconds

3. Final Answer

a. 28.25

b. 23.41

c. 2 m

d. 0.06 seconds