The length of the arc of this semi-circle is 70m. What is the length of the radius?

r = 22.3m circa

Step-by-step explanation:

We know that the perimeter of a circle can be calculated as follows:

p = 2r

So half of perimeter will be:

p/2 = r

We know that p/s = 70m, therefore:

r = 70m / = 22.3 m circa.

(x+3)(x+7)

step-by-step explanation:

4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80