First, multiply by 3 on both sides:

Divide by 7:

So,
k = 9
Its a prime number because 29 goes in to 10 numbers
If it simple interest it’s 2 years
Nice, already in vertex form
y=a(x-h)^2+k
(h,k) is vertex
therfor since (-3,6) is vertex
we are looking for something like
y=a(x-(-3))^2+6 simplified to
y=a(x+3)^2+6
A is ansre