-1 5/8 minus (-6 1/6)

4 13/24.

Step-by-step explanation:

-1 5/8 - (-6 1/6)

= - 1 5/8 + 6 1/6

= -13/8 + 37/6

LCM of 8 and 6 is 24:

= -39/24  + 148/24

= 109/24

=  4 13/24.

First we calculate the area of the entire dartboard which will constitute the total area. The total area is in the form of a circle with radius 15 inches

Total area = area of circle =

Total area =

Total area =

Next, we calculate the area of the bull's eye. Again the bull's eye is another circle whose radius is 2 inches

Bull's eye area =

Bull's eye area =

Probability that a dart thrown at random within the dartboard will hit the bull’s-eye =

Probability that a dart thrown at random within the dartboard will hit the bull’s-eye = 4/225 = 0.01777 = 1.77% = 1.8% (Option A)