Solve the problem. Assume projectile is ideal, launch angle is measured from the horizontal, and launch is over a horizontal surface, unless stated otherwise.A sprung gun at ground level fires a tennis ball at an angle of 46°. The ball lands 16 m away. What was the ball's initial speed? Round answer to the nearest tenth.
A. 156.9 m/sec
B. 4.0 m/sec
C. 14.8 m/sec
D. 12.5 m/sec
Answer: D
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Write interval notation for the given set or graph.{x ? x ? 3}
A. (3, ?) B. [3, ?) C. (-?, 3] D. (-?, 3)
Solve the problem.The half-life of radium is 1690 years. If 150 grams is present now, how long (to the nearest year) till only 100 grams are present?
Fill in the blank(s) with the appropriate word(s).
Decide whether the equation is an identity, a conditional equation, or a contradiction. Give the solution set.2(5x - 14) - 10x + 28 = 0
A. Conditional; {5} B. Identity; {all real numbers} C. Contradiction; ? D. Conditional; {0}
Use the substitution method or the elimination method to solve the system. If the system has infinitely many solutions, express the ordered pair in terms of x or y. 6x + y = 7-18x - 3y = -21
A. 
or (y, -6y + 7)
B. (x, -6x + 7) or 
C. no solution
D. (x, 6x + 7) or 