exam Maths Puzzle Numerical Ability

find the interest rate for a simple interest loan with P=$1420, I=$306.72, t=3 years

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exam Other Question

Solve the equation by finding all real roots.
x^3-7x+15x-9=0

i have this

1 -7 15 -9 /(divided by) 1.

x^2-6x+9
(x+1) (x^2-6x+9)
it says factor again and where is the soultion Write a rule for the nth term of the geometric sequence:
a3=180,a6=38,880