Use the Gauss-Jordan method to solve the system of equations. 7x - 9y = 29 35x - 45y = 145
A. (8, 3)
B. 
C. 
D. No solution
Answer: C
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Solve the problem.Carole's car averages 14.7 miles per gallon in city driving and 22.3 miles per gallon in highway driving. If she drove a total of 347.2 miles on 20 gallons of gas, how many of the gallons were used for city driving?
A. 12 gallons B. 15 gallons C. 7 gallons D. 13 gallons
Use identities to find the indicated value for each angle measure.tan ? = 
, sin ? < 0
Find cos(2?).
A. 
B. 
C. - 
D. - 
Solve the problem.A space shuttle is in a circular orbit 250 km above the Earth's surface. Use Kepler's third law( with 
) to find the orbital period of the satellite.(G = 6.67 × 10-11 Nm2 kg-2, M = 5.97 × 1024 kg and Earth's radius is 
).
A. T = 2 hr B. T = 9 min C. T = 1 hr D. T = 90 min
Approximate the value of x. Round to four decimal places.ex = 0.000126
A. 8.9792 B. -3.8996 C. 3.8996 D. -8.9792