Answer:
1.04 L
Explanation:
Charles law states that for a fixed mass of gas, volume of gas is directly proportional to the absolute temperature at constant pressure.

where V1 is the volume and T1 is absolute temperature at first instance
and V2 is volume and T2 is absolute temperature at the second instance
Absolute temperature is temperature in the kelvin scale
T1 - 25 °C + 273 = 298 K
T2 - -15 °C + 273 = 258 K
substituting the values in the equation

V2 = 1.04 L
when the temperature is -15 °C the volume is 1.04 L
Answer:
1.20x10⁻²⁰μL
Explanation:
1cm³ is equal to 1milliliter. As we must know, 1milliliter = 1000 microliters, 1000μL. To convert the 1.20x10⁻²³mL we need to use the conversion factor: 1mL = 1000μL.
The volume of tantalum in μL is:
1.20x10⁻²³mL * (1000μL /1L) = 1.20x10⁻²⁰μL
1.54 I think... if that isn't correct you should use Google, a study guide, or a calculator
I believe that the answer would be D, both the speaker and the microphone