Answer:
Step-by-step explanation:
Let's find the discriminant 

It is a positive number, therefore there are 2 solutions
3x-4
Think of times = multiplication
Less than = x-y
Step-by-step explanation:
multiply 5x+2y=19 by 3 youll get 15x+6y=57
eliminate y
7x-6y=9
<u>15x+6y=57</u><u> </u> +
22x=66
x=3
substitute x to 5x+2y=19
15+2y=19
2y=4
y=2
80=x+3x
80=4x
20=x
There are 20 girls.
Answer:Around 50 pints
Step-by-step explanation:
$35=$40
$47=$50
$57=$60
$40+$50+$60=$150/3=50