Which of the following is NOT an expression you can write to represent the total area of the water surface of the pool? A. (25+7)(8+x)
B.25 + 7 + 8 + X
C.25(8+x) + 7(8+x)
D. 25x + 7x + 25(8) + 7(8)

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)