Multiple Choice Question: What type of sequence is 12, 6, 4, 3, ...?

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Orphaned Multiple Choice Questions (MCQ) due to changes of exam system.

Find d so that x + 6 is a factor of x^4 + 4x^3 - 21x^2 + dx + 108.
It is the property of a material to absorb energy from a continuously applied load until it ruptures.
If $| 3t - 5 | \gt 4$, which of the following is correct?
The price of an article is cut by 10%. To restore it to its former value the new price must be increased by:
Albert and Bryan can do a certain task if both work together 3 days and Albert then works alone 1 day.
A lead pencil whose ends are regular hexagons was cut from a cylindrical piece of wood with the least waste.
Which of the following formulas is used to convert an annuity $A$ to its present value $P$? Assume year-end convention. $n$ is the number of periods and $i$ is the interest rate per period.
Today, I am one more than eleven times as old as my son. 9 years from now, I will be seven more than three times as old as him. How old is my son?
Solve for x if $\ln x = 2 + \ln (1 - x)$.
If P10,000 is deposited each year for 9 years, how much can a person get annually from the bank every year for 8 years starting 1 year after the 9th deposit is made. Cost of money is 14%.
3^n - 3^{n - 1} - 3^{n - 2} is equal to:
A circle has its center at (3, -27). It is tangent to the line $3x + 4y - 26 = 0$. Locate the point of tangency.
The Department of Health encourages elderly people to have a flu vaccination each year.
Water that flows from the atmosphere to the earth’s surface in any variety of forms is known as:
A 3-degree simple curve has an external distance of 23 m. What is the length of the long chord?