Answer: 
Step-by-step explanation:
Given
Speed of boat 



Answer:
-77
Step-by-step explanation:
Multiply 11 x 7 first which gives you 77. And since the Negative sign is before 11, which means the product negative always, it will be -77!
hope this helped!
Answer:
Angle ACB And Angle ECD
Step-by-step explanation:
Answer:
P=18
Step-by-step explanation:
45/20= 40.5/P
45p=810
p=18
You know the angle sum of a square is 360 degrees.
So,
360=70+120+86+x
360=276+x
Then you solve for x by isolating it (minus 276 on both sides)
360-276=276-276+x
84=x
The last angle is 84 degrees.
Have a nice day:)