Sandy has 20 coins that are nickels and dimes. If she has x nickels, how
many dimes does she have?

Number of dimes Sandy has = (20 - x)

Step-by-step explanation:

Let the number of nickels Sandy has = N

And the number of dimes she has = D

Total number of coins she has = 20

N + D = 20 (1)

If she has the number of nickels = x

Therefore, expression that represents the number of dimes she has will be

x + D = 20

D = (20 - x)

Number of dimes Sandy has = (20 - x)

x=30

step-by-step explanation:

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.