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3 years ago

Round to the nearest tenth. 99.61

Mathematics

2 answers:

castortr0y [4]3 years ago

7 0

100.00
not completely sure so correct me if I’m wrong :)

dusya [7]3 years ago

4 0

99.60 or 100.00? I haven’t done this for a longgggg time

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An airplane took 2 hours to fly 600 km against a head wind. The retrun trip with the wind took 1 and two thirds hours. Find the

Agata [3.3K]

Answer:

The speed of plane in still air is 330 kmph

Step-by-step explanation:

Given as :

The distance cover against the wind = 600 km

The time taken against the wind = 2 hours

The distance cover with the wind = 600 km

The time taken with the wind = ( 1 + $\frac{2}{3}$ ) hours

= $\frac{5}{3}$ hours

Let The speed against the wind = x - y kmph

The speed with the wind = x + y kmph

where x is the speed of plane in still air

And y is the speed of wind

So , Speed = $\dfrac{\texrm Distance}{\texrm Time}$

Or, x - y = $\frac{600}{2}$ = 300 ......A

And x + y = $\frac{600}{\frac{5}{3} }$

Or , x + y = 360 .......B

From eq A and B

( x + y ) - ( x - y ) = 360 - 300

Or, 2 y = 60

∴ y = $\frac{60}{2}$ = 30 kmph

And x = 360 - 30 = 330 kmph

Hence The speed of plane in still air is 330 kmph Answer

3 0

3 years ago

What property should be used to solve this one-step equation : a-3=7

Aleks04 [339]

Answer:

Step-by-step explanation:

a - 3 = 7 ( add 3 to both sides )

a - 3 + 3 = 7 + 3 , that is

a = 10

6 0

3 years ago

Someone pleaseeee help me

Vlad1618 [11]

1) d) 203.2 cm
2) c) 226.06 cm
3) b) 12.7 cm
4) d) 381.25 m
5) d) 324.215 m

8 0

4 years ago

Helppop!!A car and van are driving on a highway. The table shows the amount y (in gallons) of gas in the cars gas tank after dri

Korvikt [17]

Answer:

The car uses less gas

They use the same amount of gas after $\frac{640}{7}$ miles

Step-by-step explanation:

Given

The table represents the car mileage

$y = -\frac{1}{5}x + 31$ --- The van

First, calculate the car's slope (m)

$m = \frac{y_2 - y_1}{x_2 - x_1}$

From the table, we have:

$(x_1,y_1) = (60,13.5);\ \ (x_2,y_2) = (180,10.5)$

So, we have:

$m = \frac{10.5 - 13.5}{180 - 60}$

$m = \frac{-3}{120}$

$m = -\frac{1}{40}$

Calculate the equation using:

$y = -\frac{1}{40}(x - 60)+13.5$

$y = -\frac{1}{40}x + 1.5+13.5$

$y = -\frac{1}{40}x + 15$

$m = -\frac{1}{40}$ implies that for every mile traveled, the car uses 1/40 gallon of gas

Also:

$y = -\frac{1}{5}x + 31$ --- The van

By comparison to: $y = mx + b$

$m = -\frac{1}{5}$

This implies that for every mile traveled, the van uses 1/5 gallon of gas.

By comparison:

$1/40 < 1/5$

This means that the car uses less gas

Solving (b): Distance traveled for them to use the same amount of gas.

We have:

$y = -\frac{1}{5}x + 31$ --- The van

$y = -\frac{1}{40}x + 15$ --- The car

Equate both

$-\frac{1}{5}x + 31 =-\frac{1}{40}x + 15$

Collect like terms

$\frac{1}{40}x -\frac{1}{5}x =-31 + 15$

$\frac{1}{40}x -\frac{1}{5}x =-16$

Take LCM

$\frac{x - 8x}{40} = -16$

$\frac{- 7x}{40} = -16$

Solve for -7x

$-7x = -640$

Solve for x

$x = \frac{640}{7}$

5 0

3 years ago

Explain how you can use the distributive property to multiply 62 times 8.

Feliz [49]

You can use distributive property because 62 and 8 share a greatest common factor, which is 8.

4(2+7)

Hope this helps! :)

4 0

4 years ago