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2 years ago

Select all numbers that are rational.

Mathematics

1 answer:

Anon25 [30]2 years ago

7 0

Well I’m not sure what the answer is cause of how u worded it but I know it’s not d.

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Two walkers 16 miles apart travel toward each other. One travels 3 miles per hour, and the other 4 miles per hour. If the latter

lapo4ka [179]

Answer:

For This Question

if you need steps ask me

7 0

2 years ago

A motorboat takes 5 hours to travel 150 miles going upstream. The return trip takes 3 hours going downstream. What is the rate o

lys-0071 [83]

Answer:

The rate of the boat in still water is 40 miles per hour

The rate of the current is 10 miles per hour

Step-by-step explanation:

we know that

The speed or rate is equal to divide the distance by the time

Let

x ----> the rate of the current (miles per hour)

y ----> the rate of the boat in still water (miles per hour)

we have that

going upstream

$y-x=\frac{150}{5}$

$y-x=30$ ----> equation A

going downstream

$y+x=\frac{150}{3}$

$y+x=50$ ----> equation B

Solve the system of equations by elimination

Adds equation A and equation B

$y-x=30\\y+x=50\\------\\y+y=30+50\\2y=80\\y=40$

Find the value of x

$y+x=50$

$40+x=50$

$x=10$

therefore

The rate of the boat in still water is 40 miles per hour

The rate of the current is 10 miles per hour

8 0

2 years ago

Can someone give me the answers to this please

Klio2033 [76]

Subtract each number from 190 and then you have all of your answers

4 0

2 years ago

Read 2 more answers

The length of a rectangular is 2/5 meter.It's width is 1/4 of its length .What is the perimeter of the rectangle?

Varvara68 [4.7K]

I think the answer is 2 13/20
Or, in decimals: 1.3

3 0

2 years ago

A square with side x is changing with time where x(t)=3t+1. What is rate of change of the area of the square when t=2 seconds.

GuDViN [60]

Answer:

Rate of change of the area of the square is 42 units at t = 2.

Step-by-step explanation:

We note that the area of the square is given by: $A(x) = x^2$ but we aim to find $\frac{dA}{dt}$ . But we can use the chain rule to pull out that dA/dt. Doing so gives us:

$\frac{dA}{dt} = \frac{dA}{dx} \times \frac{dx}{dt}.$

Now, $\frac{dA}{dx} = 2x$ (by the power rule and $\frac{dx}{dt} = 3.$

But since we have "x" and not "t", we want to find what x is when t = 2. Substituting t = 2 gives us x(2) = 3(2) + 1 = 7.

So, finally, we see that:

$\frac{dA}{dt} = 2(7) \times 3 = 14 \times 3 = 42.$

7 0

2 years ago