Ask question

Ask question

All categories

3 years ago

13

HELP FOR BRAINIEST AND 50 POINTS

2 answers:

motikmotik3 years ago

7 0

X - speed of the current
40+x - speed with current
40-x - speed against current

t-time
(40+x)*t=100
(40-x)*t=60

40t+xt=100
<span> + 40t-xt = 60
</span> 80t =160
t = 2

40t+xt=100,
40*2+2x=100
80+2x=100
2x=100-80
2x=20
x=10 mi/h

10 mi/h speed of the current.

lapo4ka [179]3 years ago

4 0

The answer is x/10mph Hope I helped!

You might be interested in

Which type of triangle has one angle with a measurement greater than 90°?

masya89 [10]

Answer:
Obtuse-angled triangle

Explanation:
Triangles can be classified based on the measures of their angles as follows:
1- Right-angled triangle: Triangle that has one of its angles = 90°
2- Acute-angled triangle: Triangle that has all of its angles less than 90°
3- Obtuse-angled triangle: Triangle that has one of its angles greater than 90°

The attached image shows an obtuse-angled triangle. We can note that measure ∠B is greater than 90°

Hope this helps :)

7 0

3 years ago

Read 2 more answers

A cable company wants to provide cell phone service for residents on an island. The function for the cost of laying the cable fr

laila [671]

Answer:

C) domain: all real numbers greater than or equal to 0

range: all real numbers greater than or equal to 13,000

Step-by-step explanation:

We have, the function for the cost of laying cable is given by,

$c(x)= 6500\sqrt{x^2+4}$ , where x is the length of the cable (in feet).

As, 'x' represents the length of the cable.

We have that, the value of x cannot be negative.

So, x ≥ 0.

Since, the domain of $c(x)= 6500\sqrt{x^2+4}$ is the set of points where $x^2+4\geq 0$ and we have that x ≥ 0.

Thus, the domain is 'Set of all real numbers greater than or equal to 0'.

Now, we substitute x= 0 in $c(x)= 6500\sqrt{x^2+4}$ .

i.e. $c(0)= 6500\sqrt{0^2+4}$

i.e. $c(0)= 6500\sqrt{4}$

i.e. $c(0)= 6500\times 2$

i.e. c(0) = 13000.

So, we get that the vertex point of the function is (0,13000).

Thus, the range is 'All real numbers greater than or equal to 13,000'.

5 0

3 years ago

Read 2 more answers

Please help asap! brainliest to best answer! how do you do this???? and what are the answers!

Angelina_Jolie [31]

Answer:

8953.5 seconds

Step-by-step explanation:

Since the challenger descends at a rate of 4 feet per second, divide 35,814 by 4 to get the answer

8 0

2 years ago

Read 2 more answers

Why is your nose in the middle of your face

aleksandr82 [10.1K]

Well, considering this is a Math Joke, I believe, the answer is, "Because it is the scenter." Or (Center).

Hoped this helped! :)

6 0

3 years ago

Composition of Functions Help!<br> Answer choices: <br> A: -2 <br> B: 0 <br> C: 2 <br> D: -4

Vinil7 [7]

THE ANSWER IS B 0 PLS MARK ME BRALIEST

8 0

2 years ago