A restaurant bill is 56.39.Estimate a 20% tip

A.$11.28

B.$8.46

56.39 times 0.2 which equals 11.278 which becomes 11.28 and 15% tip is 56.39 times 0.15 which equals 8.4585 and becomes

the radius is 2 times the diameter.

step-by-step explanation:

given the equation is 8+9z=-6, the first step would be to subtract the 8 from both sides:

8+9z-8=-6-8

since 8 minus 8 = 0, this would cancel out the 8. and since -6 minus 8 equals -14, the equation would look like this

9z = -14