Answer:
A) 360 adults
Step-by-step explanation:
c=quantity of child
a=quantity of adult
9c+12.5a=5220
a+c=440 then c=440-a
substitute for c
9(440-a)+12.5a=5220
3960-9a+12.5a=5220
reduce
3.5a=1260
a=360
y = -x + 6
Example:
-1 +6=5
0.7 is the decimal equivalent to 70/100.
You can just do the numerator (70) divided by the denominator (100): 70÷100 = 0.7