If the speed of boat in still water iss 9 mph and takes 1.5 miles to go and come 4 miles uptream and downward then the current of the river is 9.24 mph.
Given that the speed in still water be 9 mph, time to travel 4 miles upstream and downward is 1.5 hours.
We are required to find the speed of current of the river.
let the speed of current be c mph.
Effective speed in downstream=9+c
Effective speed in upstream=9-c
Total time=1.5 hours.
Total distance=4 miles.
Time for upstream stream+ time for downward stream=1.5 hours
2/(9+c)+2/(9-c)=1.5
18-2c+18+2c=1.5(9+c)(9-c)
36=1.5(81-
)
36=121.5-1.5
1.5=121.5-36
=85.5
c=9.24 mph.
Hence the speed of the current of the river is 9.24 mph.
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In order to figure out the number of fossilized snail shell, multiply 21% by 300. first change 21% into a decimal, in order to do that, move the percent symbol two spaces to the left, and replace the "%" symbol to a decimal. 0.21 X 300= 63
so 21% of 300 is 63
Answer:
Step-by-step explanation:
To write the equation of a circle, use the formula 
where the center of the circle is (h, k).
This means the equation is 
.
Find the radius r by finding the distance between (3,2) and (9,3) using the distance formula.
Since the radius is √37 and therefore 
.
The equation is .
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Answer: All the lines which are parallel to Y-axis including Y-axis must be parallel to the line x=7.
Explanation:
We can understand it by drawing the line x=7 on the graph.
In the graph, it has shown that x=7 is parallel to Y-axis.
And if we talk about a set of lines x=n, where n is a real number then these lines are parallel to y-axis.
since, we know that if one line is parallel to another line and that line is also parallel to a third line then these three lines must be parallel.
so we can say that, All lines which are parallel to y-axis as well as y-axis are parallel to x=7.
