Answer
$8$ hours.
Work Step by Step
Let $x$ be the hours required, we have $780=150+90(x-1)$, thus $x-1=7$ and $x=8$ hours.
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 8 - Polar Coordinates; Vectors - Section 8.7 The Cross Product - 8.7 Assess Your Understanding - Page 653: 66
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