Use the graph to estimate the solution of the system of equations.x + 4y = 25x - 5y = -15
A. ?
B. {(-2, 2)}
C. {(-3, 1)}
D. {(-2, 1)}
Answer: D
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Use a graphing utility to find the equation of the line of best fit. Round to two decimal places, if necessary.
A. y = 3x B. y = 2.8x C. y = 2.8x + 0.15 D. y = 3x + 0.15
Use the table to solve the equation.8 + 2x = x + 1
A. x = -6 B. x = -5 C. x = -7 D. x = 9
Solve the problem.Use the mathematical model for power gain, G = log 
10, where P0 is the output power in watts and Pi is the input power in watts. Determine the power gain G, in decibels, for an amplifier with an output P0 of 27 watts and an input Pi of 1.1 watts. Round to five decimal places if necessary.
A. 14.133 dB B. 14.89971 dB C. 14.72756 dB D. 13.89971 dB
Solve the problem.The population of a city is 
times what it was a decade earlier. Write this mixed number as a percent.
A. 178% B. 152% C. 165% D. 65%