Question

I Need help asap please

Answer 1

15. 7.71

16. 102.83

17. 1.4

18. 19

19. a. week one: 23

week two: 47

b. About two times greater

Explanation:

15 & 16 ; to find the perimeter of a semicircle it is r(π + 2)

17 & 18; to find radius from circumference it is
`r=(C)/(2\pi )`

19 a: to find diameter from circumference it is C ÷ π