Perform the row operation(s) on the given augmented matrix. R3 = 4r1 + r3
A. 
B. 
C. 
D. 
Answer: C
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Solve the problem.The sound produced by touching each button on a touch-tone phone is described by y = sin 2?lt + sin 2?htwhere l and h are the low and high frequencies (cycles per second) in the figure shown.
Describe the sound emitted by touching the 0 key as a product of sines and cosines.
A. y = 2 sin(536?t) cos(2418?t) B. y = 2 sin(395?t) cos(2277?t) C. y = 2 sin(2418?t) cos(536?t) D. y = 2 sin(2277?t) cos(395?t)
Solve the problem.Jose Ramirez, a salesperson for a chemical company, travelled 1,539 miles on Monday, 407 miles on Tuesday, and 1,955 miles on Thursday. Find the total number of miles he travelled during these three days.
A. 3,901 mi B. 3,494 mi C. 3,801 mi D. 3,087 mi
Find the measure of each marked angle.
A. 60° and 120° B. 45° and 55° C. 90° and 270° D. 45° and 135°
Collect like terms.-2x + 1.9y - 1.6x + 9y
A. -3.6x + 1.9y + 9 B. -3.6x + 10.9y C. 10.9x - 3.6y D. -2x - 1.6x + 1.9y + 9y