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Anna71 [15]
3 years ago
15

PLS HELP!!! BRAINLIEST AND 20 POINTS!!!

Mathematics
1 answer:
Ne4ueva [31]3 years ago
4 0

Answer:

A. P=11*3 = 33 ft

   A= 21*3 = 63 ft^3

B. P = 9*3 = 27 ft

   A = 15*3 = 45 ft^3

C. P = 20*3 = 60 ft

   A = 24*3 = 72 ft^3

D. P = 13*3 = 39 ft

   A = 25*3 = 75 ft^3

Step-by-step explanation:

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a physician orders 62.25 miligrams of a drug. It is available in 20.75 miligrams tablets. how many tablets should the nurses adm
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Which explicit formula generates the infinite sequence 2, 9, 28, 65, 126, ...?
Dimas [21]
1. The terms of a sequence are denoted by u_{1} ,  u_{2}, u_{3}, u_{4}, u_{5},...

2.
 u_{1}  = 2  = 2*1

  u_{2} = 9 = 3*3
 
u_{3} = 28 = 4*7

u_{4} = 65 = 5*13

u_{5} = 126 = 6*21


3. so it is clear that the first columns add each time by one, and the second column add by 2, then by 4, by 6, by 8 and so on.

4. consider only the second column and how we get the terms, which we will call t_{1} , t_{2}, t_{3}, t_{4}, t_{5},...:

t_{1}=1

t_{2}=1+2

t_{3}=1+2+4=1+2+2*2

t_{4}=1+2+4+6=1+2+2*2+2*3=1+2(1+2+3)

t_{5}=1+2+2*2+2*3+2*4=1+2(1+2+3+4)

5.
So

u_{n}=(n+1)(1+2{1+2+3+....(n-1)})
        
         =(n+1)(1+2 [(n-1)n/2])

         = (n+1)(1+(n-1)n)
       
         =(n+1)( n^{2}-n+1 )


6. We can check: u_{3} = (3+1)( 3^{2}-3+1 )=4*(9-3+1)=4*7=28

7. Remark: Gauss addition formula: 1+2+3+....+n=n(n+1)/2


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