Find the measure of the combined angle.

Assuming the large squares represent 1 whole, the rods represent 0.1 (tenths), the small cubes represent 0.01 (hundredths), and the tiny cubes represent 0.001 (thousandths).

• 2 large squares: $2 \times 1 = 2$
• 8 rods: $8 \times 0.1 = 0.8$
• 6 small cubes: $6 \times 0.01 = 0.06$
• 4 tiny cubes: $4 \times 0.001 = 0.004$

The expression is the sum of these values.

Add the values together.

The standard form is $\boxed{\text{2.864}}$.

5. Model Real Life The mass of an African penguin is 3.599 kilograms. Write three expressions that describe the mass of the penguin.

Here are three expressions for 3.599 kilograms:

1. Expanded form (decimal):

   $$3 + 0.5 + 0.09 + 0.009 \text{ kilograms}$$

2. Expanded form (fraction):

   $$3 + \frac{5}{10} + \frac{9}{100} + \frac{9}{1000} \text{ kilograms}$$

3. Word form: Three and five hundred ninety-nine thousandths kilograms.

6. Find the measure of the combined angle.

The two angles are $27^\circ$ and $44^\circ$.

The combined angle is $\boxed{\text{71}^\circ}$.

7. Find the measure of the combined angle.

The two angles are $53^\circ$ and $85^\circ$.

The combined angle is $\boxed{\text{138}^\circ}$.