Solve the Problem $P = 14.7 e ^ { - 0.21 x }$

Multiple Choice

Solve the problem.
-The formula P $P = 14.7 e ^ { - 0.21 x }$ gives the average atmospheric pressure, P, in pounds per square inch, at an altitude x, in miles above sea level. Find the average atmospheric pressure for an altitude of 2.3 miles. Round
Your answer to the nearest tenth. A) $7.8 \mathrm { lb } / \mathrm { in } ^ { 2 }$
B) $9.1 \mathrm { lb } / \mathrm { in } ^ { 2 }$
C) $8.4 \mathrm { lb } / \mathrm { in } ^ { 2 }$
D) $11.0 \mathrm { lb } /$ in. $^ { 2 }$