
Mark M. answered 12/11/22
Tutor
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(278)
Mathematics Teacher - NCLB Highly Qualified
S9 = (9/2)(a1 + a9)
Can you substitue and solve for a1?
To solve for d
a9 = a1 + 8d
Mark M. answered 12/11/22
Mathematics Teacher - NCLB Highly Qualified
S9 = (9/2)(a1 + a9)
Can you substitue and solve for a1?
To solve for d
a9 = a1 + 8d
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