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<span>We first calculate the annual straight-line depreciation for the starting 8-year useful lifespan. This is given by the value minus the salvage value (23,000 - 1,500) divided by the 8 year lifespan, resulting in annual depreciation of 2,687.50 dollars. After four years at this rate, the vehicle has depreciated in value by 2,687.50 * 4 dollars (10,750) and has a present value of 12,250 dollars. The useable life is then reduced by 2 years so we must recalculate the straight-line depreciation. This is given by present value minus salvage cost (12,250 - 1,500) divided by the remaining 2 years of usable life. This results in a depreciation expense in both years 5 and 6 of $5,375.</span>
The perfect square trinomial will be
,
Expression 2 and 4 are correct.
<h3>What are trinomials?</h3>
A mathematical expression with three terms or three monomials is called a trinomial. Polynomials having only three terms are known as trinomials.
The second and fourth expression seems to be the perfect square let's check it.
Expression 2;
![x^2 + 14x+49 \\\\ x^2+7x+7x+49 \\\\ x(x+7)+7(x+7)\\\\ (x+7)(x+7) \\\\ (x+7)^2](https://tex.z-dn.net/?f=x%5E2%20%2B%2014x%2B49%20%5C%5C%5C%5C%20x%5E2%2B7x%2B7x%2B49%20%5C%5C%5C%5C%20x%28x%2B7%29%2B7%28x%2B7%29%5C%5C%5C%5C%20%28x%2B7%29%28x%2B7%29%20%5C%5C%5C%5C%20%28x%2B7%29%5E2)
Expression 4;
![x^2-24 x +144 \\\\ x^2-12x-12x+144 \\\\ x(x-12)-12(x-12) \\\\ (x-12)^2](https://tex.z-dn.net/?f=x%5E2-24%20x%20%2B144%20%5C%5C%5C%5C%20x%5E2-12x-12x%2B144%20%5C%5C%5C%5C%20x%28x-12%29-12%28x-12%29%20%5C%5C%5C%5C%20%28x-12%29%5E2)
Hence the perfect square trinomial will be
,
.Expressions 2 and 4 are correct.
To learn more about the trinomials refer to the link;
https://brainly.in/question/8498839
Answer:
Option B
Step-by-step explanation:
We know that a parabola is a set of points that are equidistant from a given line, which is the directrix, and a given fixed point called the focus.
So the correct option is option B.