exam Maths Puzzle Numerical Ability

A colony of bacteria has 6.5 X 10^6 members at 8 A.M. and 9.75 X 10^6 members at 10:30 A.M. Find its population at noon.

I used the formula N = No X 2 ^ t/d

9.75 X 10^6 = 6.5 X 10^6 X (2)^ 2.5/d

how do i work from here?

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exam Other Question

I need help simplifying:

4t (to the 8th) u(to the negative 5) x(to the negative 8) x (to the positive 8) times 6u(to the positive 3) times 3t(to the negative 5).

I think it's Which of the following is an equation of the line perpendicular to 3x+6y=12 and passing through (4,0)?

Answer Choices:

A) y=-1/2x+2
B) y=1/2x-2
C) y=-2x+8
D) y=2x-8