At the start of 2014 tim's house was worth 100,000. the value of the house increased by 10% every year. work out the value of his house at the start of 2018

For this case we have a function of the form:
 y = A * (b) ^ t
 Where,
 A: initial amount
 b: growth rate
 t: time
 Substituting values we have:
 y = 100000 * (1.10) ^ 4
 y = 146410
 
 the value of his house at the start of 2018 is:
 y = 146410

Exponential function