Alex has 84 quarters and nickels worth a total of $17.80.

which equation can be used to find q, the number of quarters alex has?

a. 0.25q + 0.05(q – 84) = 17.80
b. 0.05q + 0.25(84 – q) = 17.80
c. 0.25(q – 84) + 0.05q = 17.80
d. 0.05(84 – q) + 0.25q = 17.80

The value of the coin times the number of coins, summed up, equals the total value

the value of a quarter is $0.25
and quarters can be represented as a q

the value of nickels are $0.05
and can be represented with an n

there are 84 quarters and nickels in total
so
q + n = 84

which have a total value of $17.80
so
0.25q + 0.05n = 17.80

the q + n = 84 can be rearranged by subtracting q from both sides
n = 84 - q

then we can plug that into the 0.25q + 0.05n = 17.80 equation
and get
0.25q + 0.05(84 - q) = 17.80
or
0.05(84 - q) + 0.25 = 17.80

therefore your answer is D.

Maybe fx = lxl because of the way the x is positioned is that what he