21) Martha's aunt bought $26 for 20 plants. Some were Carnations selling at 4 for $3.00. The rest were Zinnias priced at
3 for $5.00. How many plants of each type did she buy?

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?