A boat has a speed of 9 miles per hour 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 in miles per hour? 2(9 â€” c) = 4(9 c) 9 c = 4(9 â€” c) 9 â€” c = 2(9 c) 4(9 â€” c) = 2(9 c)

equationwhich can be used to find c is (D) 4(9 – c) = 2(9 + c).What is an equation?equationis a formula in mathematics that expresses the equality of two expressions by connecting them with the equals sign =.mathematical statementmade up of two expressions joined by an equal sign is known as an equation.variablex as x = 7 after solving this equation.equationwhich can be used to find c:equationwhich can be used to find c is (D) 4(9-c)=2(9+c).equationshere:https://brainly.com/question/2972832The correct question is given below:A boat has a speed of 9 miles per hour 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 in miles per hour?