exam Maths Puzzle Numerical Ability

the formula for the time atraffic light remains yellow is t=1/8s +1, where t is the time in second and s is the speed limit in mph
a.solve the equation for s
b.what is the speed limit at a traffic ligth that remains yellow for 4.5 seconds

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exam Other Question

find the sum of the geometric series
6
[SUM] 2^n
n=1

n=1 2^1=2
n=2 2^2=4
n=3 2^3=8
n=4 2^4=16
n=5 2^5=32
n=6 2^6=64
2+4+8+16+32+64= 126

am I doing this correctly? Suppose that 2000.00 is invested at the rate of 6% per year compounded continuosly. What is the balance after 1year ? after 2years?