The area and the amount of gravel are illustrations of proportions.
7 lb will cover an area of 1 square foot, while 315 lb will cover an area of 45 square feet.
The given parameters are:

The number of pound for an area of <em>1 square foot </em>is calculated as follows:

So, we have:


Cross multiply

Divide both sides by 36

The area to be covered with 315lb gravel is calculated as follows:

So, we have:


Cross multiply


Divide both sides by 252

Hence, 7 lb will cover an area of 1 square foot, while 315 lb will cover an area of 45 square feet.
Read more about proportions at:
brainly.com/question/13114933
Six hundred and eighty thousand and ten.
It's impossible to give exact answer as you've not attached the image. But I think I can help you by giving some rulles about rotation. 180° rotation is (x;y) change to (-x;-y); 90° counterclockwise (x,y) change to (-y, x); then clockwise <span>90° (x,y), cange to (y, -x). Hope it will help.
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Answer:
R=0.42857
Step-by-step explanation:
ac/question, -6+2R+12R=0
14R=6
R=
R=0.42857