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3 years ago

Anyone need help? :D

Mathematics

2 answers:

Ostrovityanka [42]3 years ago

7 0

Answer:

Yes i actually do.

Step-by-step explanation:

diamong [38]3 years ago

3 0

Answer:

yeah why? are you going to help?me

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During summer, when the snow melts, the water level of the Yukon River increases. If the water level of the river increased by 7

kondaur [170]

Answer:

13 centimeters per day.

Step-by-step explanation:

We have been given that during summer, the water level of the river increased by 78 centimeters in 6 days. We are asked to find the water level increase rate in centimeters per day.

To find the water level increase rate per day, we will divide total increase by total days as:

$\text{Water level increase rate per day}=\frac{78\text{ cm}}{6\text{ days}}$

$\text{Water level increase rate per day}=\frac{13\text{ cm}}{\text{ day}}$

Therefore, the water level increase rate is 13 centimeters per day.

5 0

3 years ago

In the diagram below, what is the relationship between the number of trapezoids, n, and the perimeter, p, of the figure they for

Soloha48 [4]

Answer:

Step-by-step explanation:

it is all of the side lengths of the four sides times how many trapezoids there are

7 0

3 years ago

On Saturday, 45% of the music Brianna listened to was country songs. She listened to 27 country songs on Saturday. How many song

Arte-miy333 [17]

Answer:

60 songs.

Step-by-step explanation:

The percentages there are an equal sign so

0.45x=27

x=60

So Brianna listened to 60 songs!

5 0

3 years ago

A car is being driven at a rate of 40 ft/sec when the brakes are applied. The car decelerates at a constant rate of 10 ft/sec2.

IRISSAK [1]

Answer:

80 feet

Step-by-step explanation:

Given:

Initial speed of the car ( $v_0$ ) = 40 ft/sec

Deceleration of the car ( $\frac{dv}{dt}$ ) = -10 ft/sec²

Final speed of the car ( $v_x$ ) = 0 ft/sec

Let the distance traveled by the car be 'x' at any time 't'. Let 'v' be the velocity at any time 't'.

Now, deceleration means rate of decrease of velocity.

So, $\frac{dv}{dt}=-10\ ft/sec^2$

Negative sign means the velocity is decreasing with time.

Now, $\frac{dv}{dt}=\frac{dv}{dx}(\frac{dx}{dt})$ using chain rule of differentiation. Therefore,

$\frac{dv}{dx}\cdot\frac{dx}{dt}= -10\\\\But\ \frac{dx}{dt}=v.\ So,\\\\v\frac{dv}{dx}=-10\\\\vdv=-10dx$

Integrating both sides under the limit 40 to 0 for 'v' and 0 to 'x' for 'x'. This gives,

$\int\limits^0_{40} {v} \, dv=\int\limits^x_0 {-10} \, dx\\\\\left [ \frac{v^2}{2} \right ]_{40}^{0}=-10x\\\\-10x=\frac{0}{2}-\frac{1600}{2}\\\\10x=800\\\\x=\frac{800}{10}=80\ ft$

Therefore, the car travels a distance of 80 feet before stopping.

4 0

3 years ago

19=8+y solve for y? pleas ehelp me answer

nadya68 [22]

Answer:

Step-by-step explanation:

8+?=19

19-8=11

Y=11

7 0

4 years ago