Peggy had three times as many quarters as nickels. she had $1.60 in all. how many nickels and how many quarters did she have?
which of the following equations could be used to solve the problem?

a.) n + 3n = 1.60
b.) n + 3n = 160
c.) 5n + 75n = 1.60
d.) 5n + 75n = 160

last one.

step-by-step explanation:

last one.

generally speaking, the others follow some sort of pattern that correlates to either linear (looks like a straight line) or sinusoidal (looks like an s).

the last one is just a random cloud of points that doesn't correlate to any particular known order.

step-by-step explanation:

descending order means to order the polynomials from the term with the largest exponent to the term with the smallest exponent.  

therefore, the correct answer is d.