Y=1/20x^2
The directrix of the parabola is:
x=-5
x=5
y=-5

c.

step-by-step explanation:

correct answer:

b.(19,-2)

on monday rodney ate 1/4th of the sandwich = 3/12

on tuesday he ate 1/3rd of the sandwich = 4/12

therefore in total he has eaten = 3/12 + 4/12 = 7/12

thus we can say that he has eaten 7/12 of the sandwich on monday and tuesday alltogether.

happy to

pls mark as brainliest.