Answer:
17.3
Step-by-step explanation:
To solve this equation, you need to use the pythagorean theorem which is:

a= length
b= height
c= hypotenuse
First, substitute in your values for the equation:

Then, use the squares in the equation:

Then, subtract 100 from both sides to isolate b:

Finally, square root both sides to get your answer:

Then round to the nearest tenth which gives you 17.3.
In standard form, -3(1-8x-2y) is:
DISTRIBUTIVE PROPERTY: 3+24x+6y
ANSWER: 24x+6y-3