Express the given vector as a linear combination of the unit vectors i and j.u = 
A. 12i + 5j
B. 12i - 5j
C. 5i - 12j
D. 5i + 12j
Answer: D
Mathematics
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Evaluate the limit by direct evaluation. Change the form of the function where necessary.
A. - 12 B. 12 C. Does not exist D. 4
Mathematics
Find the difference.9.3 less 1.748
A. 8.552 B. 7.648 C. 9.000 D. 7.552
Mathematics
The letters r and ? represent polar coordinates. Write the equation using rectangular coordinates (x, y).r = 1 + 2 sin ?
A. 
= x2 + y2 + 2x
B. x2 + y2 = 
+ 2y
C. 
= x2 + y2 + 2y
D. x2 + y2 = 
+ 2x
Mathematics
Solve the problem.A projectile is fired with an initial velocity of 300 feet per second at an angle of 45° with the horizontal. In how many seconds will the projectile strike the ground? (Round your answer to the nearest tenth of a second.)
A. 18.1 seconds B. 9.9 seconds C. 13.3 seconds D. 21.4 seconds
Mathematics