Answer
See below.
Work Step by Step
The term under the square root must be non-negative, thus $4-5x\geq0\\4\geq5x\\0.8\geq x$
Thus the domain is $(-\infty,0.8]$.
$f(-1)=\sqrt{4-5(-1)}=\sqrt{9}=3$
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 3 - Test - Page 270: 2
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