Next term will be 100
as series is 18²,16²,14²,12² so next will be 10²
hope it helps
By addition of the ratio, 5/8 people are adults
144 * 5/8 = 90
C- Begin at 53, travel 34 units to the left
Let x = greater number
y = smaller number
(1)

(1)

(2)

We'll substitute y in (1) to (2)
(2)

x - 9 = 0 or x + 3 = 0
x = 9 x = -3
and
y = x - 6 y = x - 6
y = 9 - 6 y = -3 - 6
y = 3 y = -9
Therefore, the two numbers can be 9 and 3 or -3 and -9.