Use the substitution method to solve the system. x + 7y = -425x + 8y = -48
A. No solution
B. (6, 0)
C. (1, -7)
D. (0, -6)
Answer: D
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Solve the problem.The orbit of Vanguard 1 had a semimajor axis of a = 8872 km. Calculate the period of the satellite. 
and 
A. 138.6 min B. 78.2 min C. 12 hr D. 1.98 hr
Use the change of base formula and the properties of logarithms to rewrite the expression as a single logarithm in the indicated base.loge2 x7 + loge3 x15 + loge4 x16, base e
A. ln 
B. 16 ln x
C. 25 ln x
D. ln 
Use the product-to-sum identities to rewrite the expression as the sum or difference of two functions.sin 
? sin 
?
A. 
B. 
C. 
D. 
Translate the problem to a system of equations, then solve using Cramer's Rule.Jerry has 3 pieces of string. The total length is 82 inches. The sum of the two longer pieces is 70. The middle piece is twice as long as the shortest piece. What are the lengths of the 3 pieces?
A. 6, 12, and 64 inches B. 12, 24, and 46 inches C. 12, 46, and 56 inches D. No solution