The 9th term of an arithmetic progression is 8 and the 4th term is 18.
find the 1st term and the common difference, d.

a = 24 and d = -2

Step-by-step explanation:

The 9th term = a + 8d

the 4th term = a + 3d

from the question it is given that

a + 8d = 8(1)

a + 3d = 18(2)

Solve the two equations simultaneously we will be a = 24 and d = -2

for this pair of functions g(x)=x-2 and f(x)=|x| is (g o f)(a)= |a| -2

step-by-step explanation:

g(x)=x-2

f(x)=|x|

(g o f)(a)=?

(g o f)(x)=g(f(x))

(g o f)(x)=g(|x|)

(g o f)(x)=|x|-2

(g o f)(a)=|a|-2

answer: 80,000

step-by-step explanation:

the population doubles every day.

10,000*2=20,000 day 4

20,000*2=40,000 day 5

40,000*2=80,000 day 6