Q: In optics, a virtual image is an image formed when the outgoing rays from a point on an object always diverge. The image appears to be located at the point of apparent divergence. Because the rays never really converge, a virtual image cannot be projected onto a screen. In diagrams of optical systems, virtual rays are conventionally represented by dotted lines. Virtual images are located by tracing the real rays that emerge from an optical device (lens, mirror, or some combination) backward to a perceived point of origin.
Can we conclude that can you see a virtual image on a screen?
A: no

Q: Epic Rap Battles of History, or ERB for short, is a YouTube webseries created by Peter Shukoff (a.k.a. Nice Peter) and Lloyd Ahlquist (a.k.a. EpicLLOYD). The series puts famous historical and pop culture figures, real and fictional, against one another in a rap battle format. As of May 2018, the channel has over 14.2 million subscribers and over 2.9 billion total video views. The series is currently on hiatus.
Can we conclude that are they still making epic rap battles of history?
A: no

Q: In the context of nutrition, a mineral is a chemical element required as an essential nutrient by organisms to perform functions necessary for life. Minerals originate in the earth and cannot be made by living organisms. Plants get minerals from soil. Most of the minerals in a human diet come from eating plants and animals or from drinking water. As a group, minerals are one of the four groups of essential nutrients, the others of which are vitamins, essential fatty acids, and essential amino acids. The five major minerals in the human body are calcium, phosphorus, potassium, sodium, and magnesium. All of the remaining elements in a human body are called ''trace elements''. The trace elements that have a specific biochemical function in the human body are sulfur, iron, chlorine, cobalt, copper, zinc, manganese, molybdenum, iodine and selenium.
Can we conclude that is calcium a trace element in the human body?
A: no

Q: Unreported employment; working under the table, off the books, cash-in-hand, illicit work or (in UK English) moonlighting, is illegal employment that is not reported to the government. The employer or the employee often does so for tax evasion or avoiding or violating other laws. The working contract is made without social security costs, and does typically not provide health insurance, paid parental leave, paid vacation or pension funds. It is a part of what has been called the underground economy, shadow economy, black market or the non-observed economy.
Can we conclude that is it against the law to get paid under the table?
A:
yes