Answer: transportation
Step-by-step explanation:
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>
I think answer should be the first option please give me brainlest let me know if it’s correct or not okay thanks bye
Answer:
![40 \log_5 x](https://tex.z-dn.net/?f=40%20%5Clog_5%20x)
Step-by-step explanation:
![8 \log_5 x^5\\\\=8(5) \log_5 x~~~~~~~~~~~~~~~~~~~~;[\log_b m^n = n \log_b m]\\\\=40 \log_5 x](https://tex.z-dn.net/?f=8%20%5Clog_5%20x%5E5%5C%5C%5C%5C%3D8%285%29%20%5Clog_5%20x~~~~~~~~~~~~~~~~~~~~%3B%5B%5Clog_b%20m%5En%20%3D%20n%20%5Clog_b%20m%5D%5C%5C%5C%5C%3D40%20%5Clog_5%20x)
Answer:
((n-x)/n)*100
Step-by-step explanation: