Norberto received the following scores on his last five spelling tests: 96, 66, 78, 85 and 98 Which of the following statements is true?

a = 11 : 4

b = 38

c = 1 for every 6

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72

arc length = 6.63311 ft.

step-by-step explanation:

the formula the arc measure is:

arc length s=2πr(c)/360

where:

c   is the central angle of the arc in degrees

r   is the radius of the arc

π   is pi, approximately 3.142

using the above formula we get

s =

thus we find that arc length of an arc for a circle of radius 20 feet and central angle 19 degrees is

6.63311 feet