Speed of canoe in still water we will denote it CS and water itself has a speed we denote it WS. Downstream will be (CS + WS)*45 = 2, Upstream will be (CS - WS)*90 = 2. Solve the system you will find canoe speed in still water and the water speed as well. 90CS = 90WS +2, CS = WS+ 1/45 put it in the first function 90WS +1 = 2, WS = 1/90 miles per minute, CS =1/30 miles per minute.
.75 x 10 = $7.5
.25 x 30 = $7.5
They have the same amount so Noah is right
With Khan Academy, there is a small trick that can be done to see answers, you just have to click the percentage before going back into the lesson and it shows the answers you have gotten wrong, and giving you the answer for them. Opening up two tabs allows a fluent work space. Hope this sort of helps. I’m not good at math.
The answer is 81. since (-3)^2 is 9. Therefore, 9x9=81.
Answer:
the answer would be 20cm^2 i took a quiz.
Step-by-step explanation: