3 years ago

1234567891011121314151617181920

Mathematics

2 answers:

Debora [2.8K]3 years ago

4 0

Answer:

1234567891011121314151617181920

Step-by-step explanation:

Vladimir79 [104]3 years ago

3 0

Answer:

221231333113133

Step-by-step explanation:

13232232232323

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I need it done asap please help before 12:00

Gnoma [55]

That would be the y-axis

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1 year ago

Use the arithmetic sequence of numbers 1, 3, 5, 7, 9,.to find the following:

Rasek [7]

$a)\\\\
a_{n+1}-a_n=d\\
for\ n=1\\
a_2-a_1=d\\
d=3-1=2\ - difference\ between\ two\ consecutive\ terms\\\\
b)\\
a_n=a_1+(n-1)d\\
n=101\\
a_{101}=1+(101-1)*2\\
a_{101}=1+100*2=200+1=201\\\\
c)\\
Sn=\frac{a_1+a_n}{2}*n\\
n=20\\
a_n=a_{20}=1+(20-1)*2=1+38=39\\
Sn=\frac{1+39}{2}*20=400\ \ Sum\ of\ the\ first\ 20 \ numbers.$