166,674 ÷ 765 is equal to 217.8745098039
simplify as needed
10*5=50yd
28.27/2=14.135yd
9*10=90
7*21=147
9*10=90 again
50+180+147+14.135
answer = 391.135yd
The roots of a function are the x-intercepts. By definition, the y-coordinate of points lying on the x-axis is zero. Therefore, to find the roots of a quadratic function, we set f (x) = 0, and solve the equation, ax2 + bx + c = 0.
Answer:
22°
Step-by-step explanation:
cos B = (c2 + a2 − b2)/2ca
cos B = (
+
-
)/ 2(10)(6)
cos B = .925
B = 22.33
Speed of the boat = u
speed of the current = v
in downstream,
u - v = 105/5
u - v = 21
in upstream
u + v = 105/7
u + v = 15
add both equations
2u = 36
u = 18
v = -3
so
speed of the boat = 18 km/h
speed of the current = 3 km/h