Problem: Film speed:

Film speed is found from a plot of optical density vs. log of exposure for the film, known as the Dlog H curve or HurterDriffield curve. There typically are five regions in the curve: the base + fog, the toe, the linear region, the shoulder, and the overexposed region. For black-and-white negative film, the "speed point" m is the point on the curve where density exceeds the base + fog density by 0.1 when the negative is developed so that a point n where the log of exposure is 1.3 units greater than the exposure at point m has a density 0.8 greater than the density at point m. The exposure Hm, in lux-s, is that for point m when the specified contrast condition is satisfied. The ISO arithmetic speed is determined from:

What is the point at which density is 0.1 less than the base + fog?
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A: unanswerable

Problem: The only attempt at a peaceful solution to the war took place at the Conference House on Staten Island between American delegates, including Benjamin Franklin, and British general Lord Howe on September 11, 1776. Shortly after the British occupation began, the Great Fire of New York occurred, a large conflagration on the West Side of Lower Manhattan, which destroyed about a quarter of the buildings in the city, including Trinity Church.
What noted religious building was destroyed in the Great Fire?
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Answer: Trinity Church

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
According to 2004 figures, Southampton contributes around 4.2 bn to the regional economy annually. The vast majority of this is from the service sector, with the remainder coming from industry in the city. This figure has almost doubled since 1995.
Going by 2004 calculations, how much does Southampton contribute to the region's economy each year?
A: 4.2 bn

Context and question: The university's first chancellor was Joseph Gibson Hoyt. Crow secured the university charter from the Missouri General Assembly in 1853, and Eliot was named President of the Board of Trustees. Early on, Eliot solicited support from members of the local business community, including John O'Fallon, but Eliot failed to secure a permanent endowment. Washington University is unusual among major American universities in not having had a prior financial endowment. The institution had no backing of a religious organization, single wealthy patron, or earmarked government support.
Who was the first president of Washington University?
Answer: Eliot

Question: Windows Store apps run within a new set of APIs known as Windows Runtime, which supports programming languages such as C, C++, Visual Basic .NET, C#, along with HTML5 and JavaScript. If written in some "high-level" languages, apps written for Windows Runtime can be compatible with both Intel and ARM versions of Windows, otherwise they are not binary code compatible. Components may be compiled as Windows Runtime Components, permitting consumption by all compatible languages. To ensure stability and security, apps run within a sandboxed environment, and require permissions to access certain functionality, such as accessing the Internet or a camera.
Is there an answer to this question: What makes Windows apps binary code compatible?

Answer: If written in some "high-level" languages

The cloth or fiber material used, resin material, and the cloth to resin ratio determine the laminate's type designation (FR-4, CEM-1, G-10, etc.) and therefore the characteristics of the laminate produced. Important characteristics are the level to which the laminate is fire retardant, the dielectric constant (er), the loss factor (t), the tensile strength, the shear strength, the glass transition temperature (Tg), and the Z-axis expansion coefficient (how much the thickness changes with temperature).
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What element of a laminate is designated by the cloth to resin ratio, among other things?
Ah, so..
type designation