3 5/8
I think!
Look up just to be sure
If you could attach a picture I would be more than happy to help.
Let's consider the man rows to point D, at x km from C...so we have DB= (4-x) km
<span>AC = 4 km </span>
<span>CD = x km </span>
<span>AD = √(4^2 + x^2) ..... Distance travelled through river </span>
<span>Travel on land = (4 - x) </span>
<span>f(t) = distance / time </span>
<span>= [(x^2 + 16)^1/2]/6 + (4-x)/8 </span>
<span>f'(t) = 1/6 * (x^2 + 16)^(-1/2) * (2x) + 1/8 * (-1) </span>
<span>= x / [3*√(x^2 + 16)] -1/8 </span>
<span>= [8x - 3*√(x^2 + 16)] / [24*√(x^2 + 16)] </span>
<span>At f'(t) = 0 </span>
<span>0 = 8x - 3*√(x^2 + 16) </span>
<span>8x = 3*√(x^2 + 16) </span>
<span>64x^2 = 9(x^2 + 16) </span>
<span>x = 12/√55 x>0 </span>
<span>= 1.618 Km .... distance travelled throgh water </span>
<span>4 - x = 2.382 Km ......distance on foot</span>
Answer:
prime numbers
Step-by-step explanation:
2 3 7 9 11 13 are set of prime numbers
I believe it would be $887.53 because the tax would be $69.53