Though you provided no graphs, I have graphed the formula for you.
Y=(-0.5)x+12
the (-0.5/2) is the rate the leaf falls, distance/seconds.
The string was initially 20 feet long. Four fifths of one half of the string is 8 feet long, so half of the string is 10 feet long. Double 10 and you get 20. Therefore, the string was 20 feet long to begin with.
It is helpful to find a unit rate first. If you find a unit rate first, then it will be easier to compare
Answer:
$56.35
Step-by-step explanation:
15% of $49 = $7.35
$7.35 + $49(cost of meal without tax)
$7.35 + $49 = $56.35