Evaluate.
72
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Solve the problem. Unless stated otherwise, assume that the projectile flight is ideal, that the launch angle is measured from the horizontal, and that the projectile is launched from the origin over a horizontal surfaceAn ideal projectile is launched from the origin at an angle of ? radians to the horizontal and an initial speed of 
Find the position function r(t) for this projectile.
A. r(t) = (100t sin ?)i + (100t cos ? - 16t2)j B. r(t) = (100t cos ?)i + (100t sin ? - 16t2)j C. r(t) = (100t sin ? - 16t2)i + (100t cos ?)j D. r(t) = (100t cos ? - 32t2)i + (100t sin ?)j
Refer to the given figure, an isosceles triangle with AB = AC.
If the perimeter of ?ABC = 52 m, and BC = 
, what is the length AC?
A. 38 m
B. 
C. 50 m
D. 14 m
Solve. Use a calculator to approximate the irrational solutions to three places.x2 + 1 = 13
A. ±3.742 B. ±3.464 C. 2.606, -4.606 D. 2.606
Solve the equation by the square root property.x2 = -81
A. {±9i} B. {40.5} C. {9} D. {±9}