A population of 75 foxes in a wildlife preserve quadruples in size every 15 yr. the function is y = 75 x 4^x, where x is the number of 15-yr periods, models the population growth. How many foxes will there be after 45 yr? Help asap

Answer:
4800
Step-by-step explanation:
→ Find how 15yr periods there are in 45 years
45 ÷ 15 = 3
→ Substitute this value as x into the equation
75 × 4³ = 4800