Solve the equation. |k + 7| = 3 a. {–4, 10} b. {–10, –4} c. {–4, 4} d. {all real numbers greater than or equal to –10 and less than or equal to – 4}

Aboat has a speed of 9 mph in calm water. it takes the boat 4 hours to travel upstream but only 2 hours to travel the same distance downstream. which equation can be used to find c, the speed of the current? 2(9 – c) = 4(9 + c) 9 + c = 4(9 – c) 9 – c = 2(9 + c) 4(9 – c) = 2(9 + c)