PLs help!........................

D

Step-by-step explanation:

7x + 28 < 84

     - 28  -28

7x < 56

÷7    ÷7    

x < 8

If it was a negative 7 the arrow would change direction

Arithmetic is a sequence that you constantly add or subtract by only 1 number. For example: 30, 25, 20, 15, etc. You are constantly subtracting 5; or 15, 20, 25, 30, etc. You are constantly adding 5. So these sequences would arithmetic.  Geometric is when you divide or multiply by only 1 number. For example: 5,,25, 125, 625, etc. You are constantly multiplying the numbers by 5; or 625, 125, 25, 5, etc. You are constantly dividing by the number 5. So, these would be geometric. 1.6, 0.8, 0.4, 0.2 would be a geometric sequence. Geometric is the correct answer, because you are constantly dividing by 2.