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NeTakaya
3 years ago
6

Write a formula for the general term​ (the nth​ term) of the arithmetic​ sequence, a 1 comma a 2 comma a 3 comma a 4 . . . . ​th

en, use the formula for a subscript n to find a 20​, the 20th term of the sequence. 7​, 5​, 3​, 1​, ... a subscript nequals nothing
Mathematics
1 answer:
NARA [144]3 years ago
8 0

We have an initial term of 7 and a common difference of -2, so

a_n = 7 + -2(n-1) = -2n + 9

a_20 = -2(20)+9 = -40 + 9 = -31



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The pie chart shows information about voters in an election. 2800 more women vote than men. Work out the total number of voters.
Dmitry [639]
The picture in the attached figure

let
x--------> men voters
y-------> women voters

we know that
y=x+2800------> y-x=2800------> equation 1

step 1
find the percentage of women and men voters
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central angle by men voters=130°
central angle by women voters=(360°-130°)-------> 230°
by using proportion
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if 27.78% correspond to 2800 voters
100%---------------------->T
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the answer is
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