Mark M. answered 08/29/19
Tutor
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Mathematics Teacher - NCLB Highly Qualified
a6 = 2a3
a6 = a3 + 3d
2a3 = a3 + 3d
a3 = 3d
a3 = a1 + 2d
a3 = 3 + 2d
3d = 3 + 2d
d = 3
Sahar M.
asked 08/29/19The sixth term of an arithmetic progression is twice the third term, and the first term is 3. The sequence has ten terms.
(i) Find the common difference.
Mark M. answered 08/29/19
Mathematics Teacher - NCLB Highly Qualified
a6 = 2a3
a6 = a3 + 3d
2a3 = a3 + 3d
a3 = 3d
a3 = a1 + 2d
a3 = 3 + 2d
3d = 3 + 2d
d = 3
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