Rearrange the equation so q is the independent variable.

-7q+12r=3q-4r

  r = (5/8)q

Step-by-step explanation:

This means you want to express r in terms of q. Another way to say it is "solve for r."

Separate the variables by adding 4r+7q

  16r = 10q

Divide by the coefficient of r

  r = 10/16q

  r = (5/8)q . . . . simplify

i pretty sure it is

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