Posted by **Jake** on Tuesday, January 14, 2014 at 10:45pm.

The angle of elevation to the top of a 20-story skyscraper is measured to be 10 from a point on the ground 1,500 feet from the building. Find the height of the skyscraper in feet, correct to three decimal places.

(Points : 5)

260.47

73.86

972.54

264.49 <--

Let f(x) = sin-1x. Then the domain of f(x) is [-1,1] and the range is all real numbers.

(Points : 5)

True

False <--

- Math Check 2 ?s quick -
**Reiny**, Tuesday, January 14, 2014 at 11:01pm
first question is correct

#2 should be true.

sin^-1 (x) means find the angle Ø so that sinØ = x

since the result of taking the sine is always a number between -1 and +1

then for sin^-2 (x) , your choice of x has to be -1 ≤ x ≤ 1

e.g try taking sin^-1 (1.4) on your calculator

that is

2nd

sin

1.4

=

you should get an "error" result

- Math Check 2 ?s quick -
**Jill**, Tuesday, January 14, 2014 at 11:14pm
Thank you so much!

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