F(n)=45*(4/5)^n-1

f(1)=

f(n)= f(n-1)*

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)

your question is incomplete, write all the numbers in the sequence that it tells you.  

step-by-step explanation:

5

10

15

20

25

30

35

40

45

50

55

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.