SOLUTION: I have three more questions I cannot find the proper way of doing, though I do have the answers. These are npt from a book, it is from a study paper. 1.) Add (25d/2d-10)+(5d/10d-

Question 124457: I have three more questions I cannot find the proper way of doing, though I do have the answers. These are npt from a book, it is from a study paper.
1.) Add
(25d/2d-10)+(5d/10d-50)
2.)Subtract
(5/(11-y^2-11y))-(2/(11y-11))
3.)Find LCM of both
(t^2-81)and(t^2+17t+72)
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
(25d/2d-10)+(5d/10d-50)
=12.5-10+.5-50 d's cancel out. Using decimals instead of fractions obviates the need for using fractions.
-60+13=-47
.
(t^2-81)and(t^2+17t+72)
t^2-81=(t+9)(t-9)
t^2+17t+72=(t+9)(t+8)
t+9=LCM
.
Ed
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