Solve for the missing terms.
1. a1 = 4, d = -3
a. a50 =
b. S19 =
c. s50 =
2. s10 = 16 2/3, d = 2/3
a. a1 =
b. s21 =
c. a10 =
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Solve for the missing terms.
1. a1 = 4, d = -3
a. a50 =
b. S19 =
c. s50 =
2. s10 = 16 2/3, d = 2/3
a. a1 =
b. s21 =
c. a10 =
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Answer:
1.
d=28/15
S7= 75.6
a9= \frac{302}{15}
15
302
S9= 114
Step-by-step explanation:
a1 = 5.2, a7 = 16
a.) d=?
an= a1 + (n-1)d
16= 5.2 +(7-1)6
16-5.2=6d
d= 11.2/6
d=28/15
b.) s7=?
Sn= n/2 (2a1+(n-1)d)
S7= 7/2 (2(5.2)+(7-1)(28/15))
S7= 75.6
c.) a9=?
an= a1+ (n-1)d
a9= 5.2+ (9-1) (28/15)
a9= \frac{302}{15}
15
302
d.) S9=?
Sn= n/2 (2a1+(n-1)d)
S9= 9/2 (2(5.2)+(9-1)(28/15))
S9= 114
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