Respuesta :

we are given

initial amount =1800

so,

P=1800

doubles in value every 7 years

so, we can find function

[tex] A=P(2)^{\frac{t}{7} } [/tex]

now, we can plug P=1800

[tex] A=1800(2)^{\frac{t}{7} } [/tex]

now, we can plug t=42

[tex] A=1800(2)^{\frac{42}{7} } [/tex]

[tex] A=115200 [/tex].............Answer