Step 1: Identify the given radius. The radius of the circle is given as $r = 3.5 \text{ cm}$. Step 2: Write the formula for the circumference of a circle. The circumference $C$ of a circle is given by the formula: $$ C = 2\pi r $$ We will use the approximation $\pi = \frac{22}{7}$. Step 3: Substitute the values and calculate the circumference. $$ C = 2 \times \frac{22}{7} \times 3.5 \text{ cm} $$ $$ C = 2 \times \frac{22}{7} \times \frac{7}{2} \text{ cm} $$ $$ C = 22 \text{ cm} $$ The circumference of the circle is $\boxed{22 \text{ cm}}$. --- Question 17: Step 1: Identify the dimensions of the cuboid. The length $l = 15 \text{ cm}$, width $w = 10 \text{ cm}$, and height $h = 5 \text{ cm}$. Step 2: Write the formula for the volume of a cuboid. The volume $V$ of a cuboid is given by the formula: $$ V = l \times w \times h $$ Step 3: Substitute the values and calculate the volume in cubic centimeters. $$ V = 15 \text{ cm} \times 10 \text{ cm} \times 5 \text{ cm} $$ $$ V = 150 \text{ cm}^2 \times 5 \text{ cm} $$ $$ V = 750 \text{ cm}^3 $$ Step 4: Convert the volume to milliliters. Since $1 \text{ cm}^3 = 1 \text{ mL}$, the capacity in milliliters is: $$ V = 750 \text{ mL} $$ The capacity of the cuboid is $\boxed{750 \text{ mL}}$. That's 2 down. 3 left today — send the next one.