Please explain how to do this Will give

Answer

11 children tickets were sold and 10 adult tickets were sold.

Step-by-step explanation:

Okay first set your variables

x=adults 6x

y= children 4y

the first equation will be 6x+4y=104

the second will be x+y=21 because she sold 21 tickets

now this is a substitution equation. so, we rearrange the second equation so y=-x+21

now substitute the y in the first equation

6x+4(-x+21)=104

distribute the properties and you get

6x-4x+84=104

2x+84=104

move your 84 and change the sign

2x=20

x=10

now you put x into the first equation,

6(10)+4y=104

60+4y=104

move your 60 and change the sign

4y=44

y=11

So 11 children tickets were sold and 10 adult tickets were sold.

8(-10x+3.5y-7)

8×-10x + 8×3.5y + 8×-7

-80x + 28y - 56

therefore

-80x+28y-56 is the correct answer

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles