You have to use the method of FOIL (first, outer, inner and Last)
9b*9b is first
9b*1 is outer
-1*9b is inner
-1*1 is last
Together, they form the expression 81b^2 + 9b - 9b - 1
Collect like terms and the answer is 81b^2 - 1
They are isosceles
i hope helped if didn't I'm am sorry.
Answer:
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Step-by-step explanation:
so sorry
Answer:
y = 3n + 70 - 35 or y = 3n + 35
Step-by-step explanation:
you get 3n bc she gets 3 rocks per hike(n)
you get 70 - 35 or just 35 bc she started with 70 then gave half away and half of 70 is 35