Evaluate the expression using the provided information.Find cos (? - ?) given that sin ? = 0.7121 and cos ? = 0.615, and that ? and ? are between 0 and 
. Round to the nearest ten-thousandth when necessary.
A. -0.1157
B. 0.1297
C. 0.9933
D. 0.9915
Answer: C
Mathematics
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Factor by grouping.10x2 + 15xy - 4xy - 6y2
A. (5x + 2y)(2x + 3y) B. (10x - 2y)(x + 3y) C. (5x - 2)(2x + 3) D. (5x - 2y)(2x + 3y)
Mathematics
Solve the problem. Round your answer, if appropriate.One airplane is approaching an airport from the north at 157 km/hr. A second airplane approaches from the east at 299 km/hr. Find the rate at which the distance between the planes changes when the southbound plane is 27 km away from the airport and the westbound plane is 23 km from the airport.
A. -313 km/hr B. -626 km/hr C. -469 km/hr D. -156 km/hr
Mathematics
Evaluate the improper integral or state that it is divergent.
A. 1.3333 B. 1.6667 C. Divergent D. 2.6667
Mathematics
Graph the inequality on the number line.x > -6
A. 
B. 
C. 
D. 
Mathematics