Andre has $39 and owes Billy $72 for gas and groceries. How much money does Andre have?

Mathematics

1 answer:

siniylev [52]3 years ago

5 0

Answer:

$-33

Step-by-step explanation:

Andre still owes Billy money. If Andre paid Billy the 39 dollars he has, he would still owe Billy $33, which puts him $33 in the hole.

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1) We have that the equation is $x^2=20y$ , hence y=x^2/20. The standard equation of such an equation is y= $\frac{1}{4p} x^2$ . Hence, p=5 in this case. The focus is at (0,5) and the directrix is at y=-5 (a tip is that the directrix is always "opposite" the focus point of a parabola; if the directrix is at x=-7 for example, the focus is at (7,0)).
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