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isabelzavalalopez28
26.01.2021 •
Mathematics
An old movie theater charges $4 for an adult and $2 for a child's ticket. One night, 380 tickets were sold for a total of $1320. How many children attended the movie that night?
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Ответ:
0
Step-by-step explanation:
Let statements :
Let x be the number of tickets sold for an adult
Let y be the number of tickets sold for a child
Equations :
x + y = 280 OR y = 280 - x
4x + 2y = 1320
Substitution (sub the 2 equations in together) :
4x + 2(280 - x) = 1320
4x + 560 - 2x = 1320
2x = 1320 - 560
x = 760/2
x = 380
x is the number of tickets sold for the adults. meaning that 380 adults went.
Find the # of children :
x + y = 380
we know that x = 380
380 + y = 380
y = 380 - 380
y = 0
Conclusion :
No children went because the movie was rated R. Only adults attended.
Ответ:
x²+10x+25=x², 10x=-25, x=-2.5.
CHECK: g(-2.5)=2.5; h(2.5)=6.25=(-2.5)²