book Maths Puzzle Numerical Ability

What is the fourth term of (x + y)^6 ?

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book Other Question

What are the foci of the ellipse with equation (x^2/100)+(y^2/64)=1
a.(0,+or- sqroot of 164)
b.(+or- sqroot of 164,0)
c.(0,+or- 6)
b.(+or- 6,0)

i got b in part guess mode ^_^ It takes Kathy 3 hours and 40 minutes to clean the kitchen of her house. Find her work rate of the job per hour. Your answer is supposed to be a fraction. Put the the answer in the answer box.