Asked by Loisa

The fourth term of an arithmetic sequence is 18 and the sixth term is 28. Give the first 3 terms
Answered by MsPi_3.14159265
Use your arithmetic formula to get two equations in two unknowns : )
tn= a + (n-1)d
t4 = a + (4-1)d
while t4=18
18 = a + 3d
and t6 = 28
so
28 = a + (6-1)d

and then just solve the two equations in two unknowns, and I would be happy to check your solution : )
Answered by MsPi_3.14159265
Did you solve it ?? : )
Answered by Steve
the 4th and 6 terms differ by 2d
so, 2d=10
and the rest is a cinch.
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right?
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