Solve.-7a + 2 + 8a = 11 - 20
A. 33
B. 11
C. -33
D. -11
Answer: D
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Solve the equation.9 ln 7x = 81
A. 
B. {e9}
C. 
D. 
Solve the equation.61 = 7x - 9
A. {17} B. {67} C. {63} D. {10}
Solve the problem by using three variables.A company makes 3 types of cable. Cable A requires 3 black, 3 white, and 2 red wires. B requires 1 black, 2 white, and 1 red. C requires 2 black, 1 white, and 2 red. They used 100 black, 110 white and 90 red wires. How many of each cable were made?
A. 10 cable A; 103 cable B; 20 cable C B. 20 cable A; 30 cable B; 10 cable C C. 10 cable A; 30 cable B; 93 cable C D. 10 cable A; 30 cable B; 20 cable C
Solve the problem.The pitch P of a musical tone varies inversely as its wavelength W. One tone has a pitch of 408 vibrations per second and a wavelength of 5.6 ft. Find the wavelength of another tone that has a pitch of 340 vibrations per second.
A. 0.15 ft B. 0.00004 ft C. 6.7 ft D. 24,771.4 ft