The radius of the bulls-eye of the dartboard is 8 inches. the radius of each concentric circle (there are 4 labeled a, b, c, d from the inside out) is 14 inches more than the radius of the circle inside it. if a dart lands at random on the dartboard, the probability that the dart will hit in area c is what percent?

The formula for the area of a circle is A = πr².  The area for A, the innermost circle, is A=3.14(8²)=200.96 in². 
The area for B (including the area of A) is A=3.14(8+14)²=1519.76 in².
The area for C (including the areas of A and B) is A=3.14(8+14+14)²=4069.44.
The area for D (including the areas of A, B and C) is A=3.14(8+14+14+14)²=7850 in².
We now need to know how much the ring for circle C takes up.  We take the entire area for C and subtract the total area for B (since it includes A):
4069.44-1519.76=2549.68 in².
To find the percent, we divide this amount by the total area of the board, 7850:
2549.68/7850=0.3248
The probability of hitting circle C would be 32.48%.

7.3

step-by-step explanation:

81+30=111180 minus 111=691/2×19=9.569÷9.5=7.263157895~7.3