Answer:
Let's define the variables:
D = arrangements of daisies that he buys
R = arrangements of roses that he buys.
Each arrangement of daisies costs $4.25, then for D of them, the total cost is:
D*$4.25
And for the roses, the cost of each one is $6.50, then the cost for R of them is:
R*$6.50
We know that he wants to spend less than $39, then we have the inequality:
D*$4.25 + R*$6.50 < $39
And we also know that he wants to buy at least, 4 arrangements, then:
D + R ≥ 4
Now we have a system of inequalities:
D + R ≥ 4
D*$4.25 + R*$6.50 < $39
This has quite a few solutions, for example, he could buy 3 arrangements of daisies and 2 of roses, the total cost would be:
3*$4.25 + 2*$6.50 = $25.75, which is less than $39, and he is buying 5 arrangements, more than 4 as he wanted.
And there are a lot of other possible options.
