The only thing that you should do is to put 1, 2, 3, and 4 instead of the n and then you will get the first four terms!
f(1) = 4(1) - 2 = 2
f(2) = 4(2) - 2 = 6
f(3) = 4(3) - 2 = 10
f(4) = 4(4) - 2 = 14
Have a great day!
Answer:

Step-by-step explanation:
In order for the triangle to be a right one we need every side to be of the same length. see the photo for furyher explanation.
Plug in x and y
1 / [2(4)3+3.4(2)]
1 / 24+6.8
1 / 30.8
D is your answer 72/12= 6 so that is 6 feet