Answer:
sorry I did not learn those yet
To do this you want to first multiply 28 by 0.15. This will give you $4.20. You have to give a $4.20 tip. The total cost would be the lunch and the tip added together. It would give you a final total of $32.20.
Answer:
r = 2 [stream's speed is 2 mph downstream
Step-by-step explanation:
Remark
The distances traveled [upstream and downstream] are the same.
If it takes longer to go upstream, it means the speed of the current is going against him. So the rate is 38 - r where r is the speed of the current.
The rate of the downstream is 38 + r because it takes him less time to go downstream and the current is helping him go.
The times are given
Givens
- Time Upstream = 30 minutes
- Time Downstream = 27 minutes
- Distance upstream = d1
- Distance downstream = d2
- rate upstream: 38 - r
- rate downstream: 38 + r
- d1 = d2
Formula
d1 = d2
d1 = (38 - r) * 30
d2 = (38 + r) *27
(38 - r) * 30 = (38+r)*27
Solution
Remove the brackets on both sides.
38*30 - 30*r = 38*27 + 27r Add 30r to both sides
38*30 - 30r + 30r =38*27 + 27r + 30r Combine the numbers
1140 = 1026 + 57r Subtract 1026 from both sides.
114 = 57r Divide by 57
114/57 = 57r/57
r = 2
Answer:
the 3rd one
Step-by-step explanation:
Answer:
<em>Joshua is traveling at a faster rate</em>
Step-by-step explanation:
2 hours = 120 minutes (To have the same units of measurement)
30 minutes / 7 miles = 30 ÷ 7 = 4.285 = 4.3 (Brook)
120 minutes / 25 miles = 120 ÷ 25 = 4.8 (Joshua)
To begin, you would have to convert 2 hours into minutes (2 x 60), which gives you 120 minutes. Then divide your minutes by miles for both Brook and Joshua. Then once you've done that, you can then compare the travel rate of both and determine that Joshua is traveling faster.