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Lemur [1.5K]
3 years ago
10

Help please, this is a math question. <3

Mathematics
2 answers:
AfilCa [17]3 years ago
6 0
Parenthesis first
11+4=15
division second
15/3=5
what is the square root of 64? 8!
8x5=40
Answer is 40
PtichkaEL [24]3 years ago
6 0
The answer is 40 hope I helped pls give brainliest
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A riverboat travels 54 km downstream in 2 hours. It travels 57 km upstream in 3 hours. Find the speed of the boat and the speed
irakobra [83]

Here we must write and solve a system of equations to find the speed of the boat and the speed of the stream. We will find that the boat's speed is 23km/h and the river's speed is 4km/h.

First, remember the relation:

Distance = Speed*Time.

Now let's define the variables we will be using:

  • B = boat's speed
  • R = river's speed.

When the boat travels downstream, the total speed of the boat is the speed of the boat plus the speed of the river, and we know that in that case it travels 54km in 2 hours, then:

54km = (B + R)*2h

When the boat travels upstream, we must subtract the speed of the river. In that case, we know that the boat travels 57km in 3 hours, then we have:

57km = (B - R)*3h

Then our system of equations is:

54km = (B + R)*2h

57km = (B - R)*3h

To solve this, first, we need to isolate one of the variables in one of the equations, let's isolate B in the second one:

57km = (B - R)*3h

57km/3h + R = B

19 km/h + R = B

Now we can replace that in the other equation:

54km = (B + R)*2h

54km/2h = B + R

27 km/h = B + R = (19 km/h + R) + R

Now we can solve this for R:

27 km/h = 19km/h + 2*R

27 km/h - 19km/h = 2*R

8 km/h = 2*R

(8km/h)/2 = 4km/h = R

Now that we know the value of R, we can use:

B = 19 km/h + R  = 19 km/h + 4km/h = 23 km/h

So the boat's speed is 23km/h and the river's speed is 4km/h.

If you want to learn more, you can read:

brainly.com/question/12895249

5 0
3 years ago
Guys you are awesome. Can you help me again?
salantis [7]
The correct answer is B
8 0
3 years ago
A verbal phrase in a word problem that is a key word for subtraction
elena55 [62]

Answer:

decrease, sub,minus,and less than

Step-by-step explanation:

NO STEP NEEDED

4 0
3 years ago
T-y + 53 squared 6 when t = 250 and y = 150
Novosadov [1.4K]

Answer:

thats the kind of work u have in 7th grade thats sad

Step-by-step explanation:

7 0
2 years ago
Length of a river 27km 7m 170cm 270mm
NeX [460]
Set it up together and that's all you got to do
3 0
3 years ago
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