Step-by-step explanation:
Since Bridget rows 1 hour 4 kilometers upstream and 30 minutes (half of one hour) kilometers, downstream, then we have to find the average speed of both times. First, let's find how long Bridget would have to row upstream every kilometer.
Step 1:
60 minutes ÷ 4 kilometers = 15 minutes per kilometer (upstream)
30 minutes ÷ 4 kilometers = 7.5 minutes per kilometer (downstream)
Step 2:
Now, we find the average of 15 and 7.5. To do that, we add the values together and divide them by the number of values there are (2).
15 + 7.5 = 22.5
22.5 ÷ 2 = 11.25
Answer: Bridget takes 11.25 minutes to row 1 kilometer in still water.
Answer:
There were 84 students in 6th grade, 68 in 7th grade, and 90 in 8th grade.
Step-by-step explanation:
Given that Elk middle school has 264 students, and there are 84 students in the eighth grade, and there are 22 fewer seventh-grade students than sixth-grade students, to determine how many students there are in each grade, the following calculation must be performed:
(264 - 84) / 2) - 22 = X
(180/2) - 22 = X
90 - 22 = X
68 = X
6th grade = 84
7th grade = 68
8th grade = 90
Therefore, there were 84 students in 6th grade, 68 in 7th grade, and 90 in 8th grade.
Answer:
c
Step-by-step explanation:
The vertex is like the top point of the pyramid. If we cut in that direction, we essentially cut the pyramid in half. This makes a triangle crossection
If the sound of the quietest noise a person can hear is x, then the sound of the normal conversation is x(10^6). Also, the sound of the jet at takeoff is x(10^14). When we divide x(10^14) by x(10^6), we get the answer that is equal to 10^8. Thus, the sound of jet at takeoff is 10^8 times that of the normal conversation.