Sat practice Test #8 Answer Explanations

Choice A is the best answer. No change is needed because the larger 
“spherically symmetric” droplets indicate that the flights remedied the 
problem of smaller deformed droplets mentioned earlier in the passage.
Choices B, C, and D are incorrect because none of these choices refers 
to the size or shape of the biofuel droplets, which is what made the 
investigation of combustion and fire on Earth problematic.
QUESTION 44
Choice C is the best answer. No comma is needed in the underlined 
phrase, which clearly and concisely expresses the improved techniques 
for fighting fires in space or at future outposts on the Moon and Mars 
that may result from better combustion-rate models.
Choices A and B are incorrect because the commas are incorrectly 
separating the prepositional phrases from the noun “techniques.” 
Choice D is incorrect because the pair of commas indicate that 
the information contained between them is nonessential, which 
isn’t accurate.
Section 3: Math Test – No Calculator
QUESTION 1
Choice D is correct. Combining like terms on each side of the 
given equation yields 6x − 5 = 7 + 2x. Adding 5 to both sides of 
6x − 5 = 7 + 2x and subtracting 2x from both sides yields 4x = 12. 
Dividing both sides of 4x = 12 by 4 yields x = 3.
Choices A, B, and C are incorrect because substituting those values 
into the equation 3x + x + x + x − 3 − 2 = 7 + x + x will result in a 
false statement. For example, in choice B, substituting 1 for x in the 
equation would give 3(1) + 1 + 1 + 1 – 3 – 2 = 7 + 1 + 1, which yields the 
false statement 1 = 9; therefore, x cannot equal 1.
QUESTION 2
Choice A is correct. The line passes through the origin. Therefore, this 
is a relationship of the form d = km, where k is a constant representing 
the slope of the graph. To find the value of k, choose a point (m, d) on 
the graph of the line other than the origin and substitute the values 
of m and d into the equation. For example, if the point (2, 4) is chosen, 
then 4 = k(2), and k = 2. Therefore, the equation of the line is d = 2m.
Choice B is incorrect and may result from calculating the slope of the 
line as the change in time over the change in distance traveled instead 
of the change in distance traveled over the change in time. Choices 
C and D are incorrect because each of these equations represents a 
line with a d-intercept of 2. However, the graph shows a line with a 
d-intercept of 0.

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ANSwER ExPlANATIONS
| SAT Practice Test #8
QUESTION 3