Question

the population of a city increases by 4000 people each year.in 2025 the population is projected to be 450000 what is an equation that gives the citys population p in thousands of people x after 2010

Answer 1

Assuming this is linear
write everything in thousands smaller

p=mx+b
b=initial amount
m=growth rate

city increases by 4 each year
in 2025, population is 450
find it after 2010, with 2010 being year 0 or x=0

so
2025-2010=15 years
15*4=60
increased by 60
450=result=increase+originalin2010
increase=60
450=60+original
minus 60
390=original

p=4x+390