If f(x) = 5x – 2 and g(x) = 2x + 1, find (f + g)(x). a. 7x – 1 b. 4x – 3 c. 3x – 1 d. 7x – 3

7x+8y=-18, 4x-9y=-3 solve the system of equations

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]