Answer:
The speed of the boat is 20 km/hr
Step-by-step explanation:
Let s be the speed of boat in still water
Let d be the distance
Upstream speed = s-4
Jane took 30 min to drive her boat upstream to water-ski at her favorite spot.
So, Distance traveled in upstream =
Downstream speed = s+4
So, Distance traveled in downstream = 
So, 
30s-120=20s+80
10s=200
s=20
Hence The speed of the boat is 20 km/hr
The answer is: 1.49
i used a calculator.
Answer:
1. 125,000
3 17.5
4. 15
5. 17.5
Step-by-step explanation:
1. Create a unit rate. 20,000/8 = 2,500 straws per hour. This means in 50 hours multiply 2500*50 = 125,000.
3. Mean is the average and is found by adding all the date points and dividing by the number of them.
15 + 16 + 17 + 23 + 1 1+ 19 + 20 + 15 + 18 + 22 + 15 + 19 = 210
210 / 12 = 17.5
4. The mode is the number that occurs most often. Write the numbers in order and choose the one that happens the most.
11, 15, 15, 15, 16, 17, 18, 19, 19, 20, 22, 23
15 is the mode
5. The median is the number in the middle. If two numbers then take the average. The numbers in the middle when written in order are 17 and 18. So the 17+18 / 2= 17.5
Answer:
72
Step-by-step explanation:
Exhaustive search shows the numbers to be 12, 24, 36. The sum of these three numbers is 72.
Answer:
Step-by-step explanation:
We khow that Mary invested 12000£ and the account pays 1.5 percent interest per year.
So we should khow what is the value of this 1.5 percent interst .
12000£⇒100 percent
x ⇒ 1.5 percent
- x=
=180 - mary inested for 2 years so : 2x=2*180=360
so the value after 2 years is : 12000+360=12360
