Which of the following best describes rotational symmetry?
a. the quality a design has if its left and right halves are mirror images of each other
b. the quality a design has if it maintains all of its characteristics when it is rotated about an axis lying in its plane
c. the quality a design has if the top and bottom halves are mirror images of each other
d. the quality a design has if it maintains all of its characteristics when it is rotated around a point in its plane

Answer is in fact D on APEX.

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rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500

answer: y=0 if that is what u r looking for