Answer:
-3x+4
Step-by-step explanation:
The answer is -3x+4 because first you have to compine like terms then you will get -3x , then you will get the answer -3×+4 .
a) Explain why this sequence is an arithmetic sequence.
It is an arithmetic progression since it is a succession of numbers such that the difference of any pair of successive terms in the sequence is constant, in this case, it is 3.
b) Write out the sequence using blanks where appropriate.
Week|Distance
1 5
2 8
3 1 1
4 14
. .
. .
. .
c) Write the explicit formula for the sequence.
an = a1 + d*(n -1)
an = 5 + 3*(n - 1)
an = 5 + 3*n - 3
an = 3*n + 2
d) How far will the patient walk during the 12th week?
a12 = 3*12 + 2
a12 = 38
that is to say, in that week I walk 38 km
room=400
Ppl=25p
Total cost=775
775=25p+400 ⟨—— equation
775-400=25p
375/25=p
15=p
15 people attended his party
