carl has 45 coins, and 18 of the coins are pennies. the rest of his coins are dimes.

to find what percent of his total coins are dimes, carl must find what unknown information first?
a. the precent of coins he has in total
b. the total number of coins he has
c. the number of coins that are dimes
d. the percent of coins that are nickles

C. The number od coins that are dimes

arrange the equations with like terms in columns.

analyze the coefficients of x or y.

add the equations and solve for the remaining variable.

substitute the value into either equation and solve.

check the solution.

step-by-step explanation:

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step-by-step explanation: