Answer:
9 mph = the speed in still water
Step-by-step explanation:
Let r = the speed in still water
Then the speed going down stream is r + 3
and the speed going upstream is r - 3
d = rt or t = d/r
time going downstream is 16/(r + 3) and time going upstream is 16/(r - 3)
The total time was 4 hours, so
Multiply thru the equation by (r + 3)(r - 3)
Then 16(r - 3) + 16(r + 3) = 4(r + 3)(r - 3)
16r - 48 + 16r + 48 = 
- 36
- 36 = 32r
- 32r - 36 = 0
4(r - 9)(r + 1) = 0
r = 9 or -1
But a rate of speed cannot be negative, so x ≠ -1
So, r = 9 mph = the speed in still water
Given that the diameter of circle = twice the radius, the value of x = 4.7.
<h3>What is the Diameter of a Circle?</h3>
The diameter of a circle is a segment that divides the circle into two halves.
Diameter = 2(radius of circle).
Given:
Radius of circle = x + 1.5
Diameter = 9 2/5 = 9.4 cm
Therefore:
2(x + 1.5) = 9.4
2x + 3 = 9.4
2x = 9.4
x = 9.4/2
x = 4.7
Therefore, given that the diameter of circle = twice the radius, the value of x = 4.7.
Learn more about diameter of circle on:
brainly.com/question/26196487
It would be 4x +8
Step-by-step explanation: combine like terms 2x and 2x would be 4x and add 7 and one
I am unable to draw a box and whisker plot but I did come up with the following information:
MEAN: 17.1
MEDIAN: 16.5
MODE: 16, 17
UPPER OR 3RD QUARTILLE: 18
LOWER OR 1ST QUARTILLE: 15
RANGE: 10
