Arithmetic Sequence 6Fd83F
1. The problem states that $x$, 17, $3x - y^2 - 2$, and $3x + y^2 - 30$ are four consecutive terms of an increasing arithmetic sequence.
2. In an arithmetic sequence, the difference between consecutive terms is constant. Let this common difference be $d$.
3. Using the terms, we write the equations for the common difference:
$$17 - x = d$$
$$3x - y^2 - 2 - 17 = d$$
$$3x + y^2 - 30 - (3x - y^2 - 2) = d$$
4. Simplify the differences:
$$17 - x = d$$
$$3x - y^2 - 19 = d$$
$$3x + y^2 - 30 - 3x + y^2 + 2 = d$$
$$2y^2 - 28 = d$$
5. Since all equal $d$, set them equal to each other:
$$17 - x = 3x - y^2 - 19$$
$$3x - y^2 - 19 = 2y^2 - 28$$
6. Solve the first equation:
$$17 - x = 3x - y^2 - 19$$
$$17 + 19 = 3x - y^2 + x$$
$$36 = 4x - y^2$$
$$4x - y^2 = 36$$
7. Solve the second equation:
$$3x - y^2 - 19 = 2y^2 - 28$$
$$3x - y^2 - 19 - 2y^2 + 28 = 0$$
$$3x - 3y^2 + 9 = 0$$
$$3x - 3y^2 = -9$$
$$x - y^2 = -3$$
8. From step 7, express $x$:
$$x = y^2 - 3$$
9. Substitute $x$ into step 6:
$$4(y^2 - 3) - y^2 = 36$$
$$4y^2 - 12 - y^2 = 36$$
$$3y^2 - 12 = 36$$
$$3y^2 = 48$$
$$y^2 = 16$$
10. Substitute $y^2 = 16$ back to find $x$:
$$x = 16 - 3 = 13$$
11. Now find the four terms:
$$x = 13$$
$$17$$
$$3x - y^2 - 2 = 3(13) - 16 - 2 = 39 - 18 = 21$$
$$3x + y^2 - 30 = 39 + 16 - 30 = 25$$
12. Verify the common difference:
$$17 - 13 = 4$$
$$21 - 17 = 4$$
$$25 - 21 = 4$$
13. Sum the four terms:
$$13 + 17 + 21 + 25 = 76$$
14. Check divisibility of 76 by the given options:
- Divisible by 5? No (ends with 6)
- Divisible by 2? Yes (76 is even)
- Divisible by 3? No (7+6=13, not multiple of 3)
- Divisible by 11? No (7-6=1, not multiple of 11)
- Divisible by 7? No (7*10=70, 7*11=77)
Final answer: The sum is divisible by 2.