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Ne4ueva [31]
2 years ago
9

Helppppppppppppppppppppp!

Mathematics
1 answer:
In-s [12.5K]2 years ago
5 0

Answer:

1:3

Step-by-step explanation:

Since your scaling down you divide the smaller number by the larger number

7/21=1/3

=1:3

Hope this helps :)

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PLEASE HELP 100 POINTS!!! The function f(x)=12sin(x−π4) is used to describe a water wave. The value x is the time in seconds, an
Digiron [165]
|0, pi | i’m pretty sure is the answer
6 0
2 years ago
An airplane flew 4 hours with a 25 mph tail wind. The return trip against the same wind took 5 hours. Find the speed of the airp
balu736 [363]

Answer:

r  = 225 Mil/h     speed of the airplane in still air

Step-by-step explanation:

Then:

d  is traveled distance   and r  the speed of the airplane in still air

so the first equation is for a 4 hours trip

as  d = v*t

d  =  4 *  ( r  + 25)    (1)          the speed of tail wind  (25 mil/h)

Second equation the trip back in 5 hours

d  =  5  * ( r  - 25 )    (2)

So we got a system of two equation and two unknown variables  d  and

r

We solve it by subtitution

from equation (1)     d  =  4r  + 100

plugging in equation 2

4r  + 100  = 5r -  125    ⇒   -r  =  -225     ⇒    r  = 225 Mil/h

And distance is :

d  =  4*r  +  100         ⇒ d  =  4 * ( 225)  +  100

d  =  900 +   100

d  = 1000 miles

6 0
3 years ago
Select all of the terms that are "like."<br><br> xy2<br> 2xy<br> x2<br> -xy<br> 2x2y<br> 1/2xy
irakobra [83]
Hi,
The like terms are 2xy, -xy and (1/2)xy, since they have the same variables and powers.
4 0
3 years ago
Solve the system of equations by substitution.<br> y = 5x - 13<br> 4x + 3y = 18<br> The solution is
Rudik [331]

Answer:

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Step-by-step explanation:

1.) 4x+3(5x-13)=18

expand into 4x+15x-39=18

18+39= 57

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57/19= 3 so x=3

substitute 3 into y= 5x - 13

and you get 2 so y=2

3 0
3 years ago
-12=5(6x+4)+7(x+6) is the question
Ilia_Sergeevich [38]

Answer:

x=-2

Step-by-step explanation:

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37x+62=-12

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I hope this will help you

3 0
3 years ago
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