13) The length of a couch is 200 centimeters. This is 16
centimeters less than 3 times the
width of a matching chair. How
wide is the chair?

72 cm

Step-by-step explanation:

200+16=216

216/3=72 cm

for b its (t) and c its (d)

step-by-step explanation:

9.55 degrees.

step-by-step explanation:

the given angle is

1 cycle is equal to 2π radians. so 4π will be equal to two cycles.

5.166667π-4π = 1.166667π

hence, this angle goes a little more than negative x axis.

1.166667π-π= 0.166667π

hence, the reference angle is 0.166667π radians.

1 radian = 57.2958 degrees

now, in degrees, this should be equals to 9.55 degrees.