if someone could help me with these seven HW problems. i had do do 75 of them, i just cant figure out these 7! help is much needed..thanks you so much!

Simplify

#1. 6t^2-7t-5 all over 2t+1

#2 q^2-11q+30 Divided by q^2-2q-24

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2q^2-7q-15 q^2-q-20

#3 4x+12 over 3-x minus 3x+15 over 3-x

#4 x+3 over x^2-3x-10 minus 2 over x-5

#5 x^-2-y^-2 over y^-1-x^-1

Solve the Equation

#6 3x over x^2-9 Plus 1 over x-3 = 3 over x+3

Word Problem

#7 Following a severe snowstorm, Ken and Bettina must clear their driveway and sidewalk. Ken can clear the snow by himself in 4 hours, and bettina can clear the snow be herself in 6 hours. After bettina has been working for 3 hours, ken is able to join her. how much longer will it take them working together to remove the rest of the snow.

Any help would be much appreciated. Thank You!