exam Maths Puzzle Numerical Ability

problem #1) 12a^7+16a^5-8a^2/-4a^2

problem #2) N=3(x-7)+Ty^3 for x=3, y=4, T=6

problem #3) R=T^2+(z-x)^2-2y for x=3, y=4, z=5, T=6

problem #4) Solve for R
S=PRT/3+T

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exam Other Question

Angle AB are pararelle to CD abd cut by transversal EFGH.

if measure angle EFB = 4x+5 and measure angle FGD = 8x-13,find measure angle EFB. Can you help??? Simply the following:
(3a^2)^-2

and
6x^-2 divided by x^-3

Thanks for helping!!