Answer: option D
The last option
Step-by-step explanation:
Which graph represents this system 2x-5y=-5
y=2x/5+1
Comparing the equation with the slope intercept equation, y= mx + c,
The slope,m = 2/5
From the graph, slope = (change in value of y)/ (change in value of x)
= (y2 - y1) / (x2-x1)
y2 = 1
y1 = 0
x2 = 0
x1 = 2.5
Slope, m =( 1-0)/(0 - - 2.5) = 1/(0+2.5)
= 1/2.5
Multiply numerator and denominator by 2
m= (1×2)/(2.5×2)
= 2/5
This corresponds to the slope of the equation given at the beginning.
Let c represent the speed of the current.
time = distance / speed
total time = time going upriver + time going downriver
2 2/3 = 6/(9 -c) + 6/c
(8/3)(c)(9 -c) = 6c +6(9 -c)
(8/3)c^2 -24c +54 = 0
c = (24 ± √((-24)^2 -4(8/3)(54)))/(2*8/3)
.. = (3/16)(24)
c = 4.5
The speed of the river's current is 4.5 km/h.
Answer:15
Step-by-step explanation:
0.2*75=15 students
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