Carry out the conversions of $88.6 \mathrm{~m}^3$ to liters.

What is the result of the following calculation to the correct number of significant figures?

$$(6.266-6.261) \div 522.0=$$

Classify the below statement as a hypothesis, law, or theory.

There are many civilizations more advanced than ours on other planets.

Classify the below statement as a hypothesis, law, or theory.

The universe as we know it started with a big bang.

Classify the below statement as a hypothesis, law, or theory.

The force acting on an object is equal to its mass times its acceleration.

The average speed of helium at $25^{\circ} \mathrm{C}$ is $1255 \mathrm{~m} / \mathrm{s}$. Convert this speed to miles per hour (mph).