%%

In air, the speed of sound $S$, in meters per second, is a linear function of the air temperature $T$, in degrees Celsius, and is given by $S(T)=0.6 T+331.4$. Which of the following statements is the best interpretation of the number 331.4 in this context?

SAT · Math · previous-year question

  1. A.The speed of sound, in meters per second, at $0^{\circ} \mathrm{C}$correct
  2. B.The speed of sound, in meters per second, at $0.6^{\circ} \mathrm{C}$
  3. C.The increase in the speed of sound, in meters per second, that corresponds to an increase of $1^{\circ} \mathrm{C}$
  4. D.The increase in the speed of sound, in meters per second, that corresponds to an increase of $0.6^{\circ} \mathrm{C}$

Answer

A. The speed of sound, in meters per second, at $0^{\circ} \mathrm{C}$

Explanation

Choice A is correct. The constant term 331.4 in $S(T)=0.6 T+331.4$ is the value of $S$ when $T=0$. The value $T=0$ corresponds to a temperature of $0^{\circ} \mathrm{C}$. Since $S(T)$ represents the speed of sound, 331.4 is the speed of sound, in meters per second, when the temperature is $0^{\circ} \mathrm{C}$.Choice B is incorrect. When $T=0.6^{\circ} \mathrm{C}, S(T)=0.6(0.6)+331.4=331.76$, not 331.4 , meters per second. Choice $C$ is incorrect. Based on the given formula, the speed of sound increases by 0.6 meters per second for every increase of temperature by $1^{\circ} \mathrm{C}$, as s

Practice more SAT questions

Answer thousands more real SAT previous-year questions free, get graded instantly, and climb the global ranked leaderboard.

Practice SAT free →

More SAT Math questions