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)

Question

Responses

both Ivy and Andrey
both Ivy and Andrey

only Andrey
only Andrey

only Ivy
only Ivy

neither Ivy nor Andrey

Answer 1

only Ivy

Ivy is correct with the formula an=19−19n.