there are 4 people of different heights standing in order of increasing height. the difference is 2 inches between the first person and the second person, and also between the second person and the third person. the difference between the third person and the fourth person is 6 inches and the average height is 75. how tall is the fourth person?	Pick one:
A) 73
B) 75
C) 77
D) 79
E) 81
<gadget id="calculator">75 * 4</gadget>
<output>300</output>

<gadget id="calculator">4 + 6</gadget>
<output>10</output>

<gadget id="calculator">6 + 10</gadget>
<output>16</output>

<gadget id="calculator">300 - 16</gadget>
<output>284</output>

<gadget id="calculator">284 / 4</gadget>
<output>71</output>

<gadget id="calculator">71 + 10</gadget>
<output>81</output>

<result>E</result>
there are 4 people of different heights standing in order of increasing height. the difference is 2 inches between the first person and the second person, and also between the second person and the third person. the difference between the third person and the fourth person is 6 inches and the average height is 75. how tall is the fourth person?
add(divide(subtract(multiply(75, 4), add(6, add(4, 6))), 4), add(4, 6))
let x be the height of the first person . then the heights are x , x + 2 , x + 4 , and x + 10 . 4 x + 16 = 4 ( 75 ) = 300 x = 71 and the fourth person has a height of 71 + 10 = 81 inches the answer is e .