csat-suneung 2018 Q5

csat-suneung · South-Korea · csat__math-science 3 marks Exponential Functions Variation and Monotonicity Analysis
What is the maximum value of the function $f ( x ) = 1 + \left( \frac { 1 } { 3 } \right) ^ { x - 1 }$ on the closed interval $[ 1,3 ]$? [3 points]
(1) $\frac { 5 } { 3 }$
(2) 2
(3) $\frac { 7 } { 3 }$
(4) $\frac { 8 } { 3 }$
(5) 3
What is the maximum value of the function $f ( x ) = 1 + \left( \frac { 1 } { 3 } \right) ^ { x - 1 }$ on the closed interval $[ 1,3 ]$? [3 points]\\
(1) $\frac { 5 } { 3 }$\\
(2) 2\\
(3) $\frac { 7 } { 3 }$\\
(4) $\frac { 8 } { 3 }$\\
(5) 3