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2n + 2

Step-by-step explanation:

The formula for nth term of an arithmetic progression is

In this example we have d = 2 (difference, +2 each time) and a1 =4 (first term of sequence).

+25 = x

step-by-step explanation:

here x is the hypotenuse of a right triangle whose legs are 7 and 24.   by the pythagorean theorem, 7² + 24² must equal x²:

x² = 49 + 576 = 625.   thus, x = +√625 = +25 = x