Ivy and Andrey were asked to find an explicit formula for the sequence 19, 0, −19, −38, …. Ivy said the formula is an=19−19n. Andrey said the formula is an=−19+19n. Who is correct?(1 point)
Responses
both Ivy and Andrey
both Ivy and Andrey
neither Ivy nor Andrey
neither Ivy nor Andrey
only Ivy
only Ivy
only Andrey
only Ivy
The correct formula is an = 19 - 19n.