Solve the equation.?x? = -0.42
A. {0.42}
B. {2.4, -2.4}
C. {-0.42}
D. ?
Answer: D
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Solve the problem.Two distinct even numbers are selected at random from the first ten even numbers greater than zero. What is the probability that the sum is 30?
A. 
B. 
C. 
D. 
Solve the given differential equation.(9x2 - 8x)dx - dy = 0
A. 3x3 - 4x2 + C B. 3x3 - 8x2 + C C. 9x3 - 8x2 + C D. 9x3 - 4x2 + C
Solve using the multiplication principle.6.9x = 13.8
A. 6.9
B. 11.8
C. 
D. 2
Solve the problem.A projectile is fired from a height of 7.3 feet with an initial velocity of 122 ft/sec at an angle of 48° with the horizontal. The parametric equations for the path of the projectile are x = (122 cos 48°)t, and y = 7.3 + (122 sin 48°)t - 16t2,where x and y are in feet and t is in seconds. Determine the maximum height reached by the projectile. Round your answer to the nearest tenth of a foot.
A. 135.7 ft B. 143 ft C. 128.4 ft D. 264.2 ft