Acollection of 108 coins containing only quarters and nickels is worth $21. which value could replace q on the chart? 21 108 21 – n 108 – n

let us take number of nickels coins = n and

number of quarters coins = q.

total number of coins = 180 coins.

total number of coins = number of nickels coins + number of quarters coins.

we took number of nickels coins by   variable n and number of quarters coins by variable q and we are given total 180 number of coins.

plugging the values n and q in above eqaution, we get

180 = n + q.

we need to find the value of variable q in term of n.

n is added with q on right side. the reverse oepration of addition is subtractcion. so, we need to subtract n from both sides, we get

180-n = n -n + q.

180-n =q.

therefore, 180-n value could replace q.

the total is 180 coins and you want to know q. if n+q = 180, then 180-n = q

answer: yes youre right.

step-by-step explanation:

lockers 1, 4, 9, 16, 25, 40, and 49 are open

i ran through it by the other answer is wrong