The main idea here is identifying a metal that is both very light in weight and has a silvery-white appearance, which makes it ideal for everyday items like cans and pans. Aluminum fits perfectly because it has a very low density, so it’s lightweight, and its surface looks silvery-white. It’s also easy to shape and resists corrosion well, especially important for cookware and food containers. That combination of lightness, look, and practical properties is why aluminum is the metal you see in most cans and many pans. The other metals don’t match those characteristics for this use. Iron is much heavier and tends to rust, gold is dense and expensive, and copper is not silvery-white (it’s reddish-brown and also heavier).

The idea here is recognizing common phrasal verbs and how “off” changes their meaning. Put off means to postpone something, like pushing back a meeting to a later time, or it can mean to discourage or deter someone from doing something, as in a bad experience that puts you off trying it again. That dual sense makes it the right choice for “postpone or to discourage.” The other phrases don’t fit: put on is about wearing or pretending, run out of means you have no more left, and make up for means to compensate for something. So the best option for postponing or discouraging is put off.

Think of the data you collect in a study as the numerical information you analyze to uncover patterns. Statistics is the word that refers to that data itself—the measurements, survey responses, and results you gather to reveal patterns, trends, or relationships. The other terms don’t fit this idea: uplift is about an increase in response in some contexts, acidic describes pH, and thumb is a body part. So the best fit for the amount of data used to reveal patterns is statistics.

In fractions, the bottom number is called the denominator. It shows how many equal parts the whole is divided into. For example, in a fraction like 3/4, the bottom 4 tells you the whole is split into four parts, and the top number tells you how many of those parts you’re counting. The other terms listed aren’t math terms for fractions—kilometer is a distance unit, solvent is a chemical term, and ghost isn’t related to fractions. So the bottom number is the denominator.