Answer:
Step-by-step explanation:
Not sure what the clear dot means, but the following is always true:
h(k(any number, let’s say N))=N.
x is the middle line because it divides each catheter into two equal parts.
==> x is half the hypotenuse.

We need to add like terms, meaning add the x's together and add the regular numbers together.
So if we add the x's together, -8x+9x = 1x.
Then when we add the numbers together, -12+4 = -8.
Combine our two sums and we get x-8 as the final answer.
Step-by-step explanation:
1st term = a(1) = 3(1) + 2 = 5
50th term = a(50) = 3(50) + 2 = 152
Sum of first 50 terms = (5 + 152) * (50/2) = 3925.