Algebra Math sequence

Question

Extend the sequences shown.

Sequence 1:

The height of a turtle compared to the surface of the water is shown in the sequence.

At stage 1, the turtle is 8 inches above the water.

8, 4, 0, -4, [ ],[ ]

Sequence 2:

week population of ants (thousands)

1 2

2 6

3 18

4 [ ]

5 [ ]

Answer 1

The first sequence is arithmetic, it is decreasing by 4 each time.

-4-4 = -8

-8-4 = -12

The second sequence is geometric, it multiplies by 3 each time.

18x3 = 54

54x3 = 162