Answer:
Total cost = 16
Step-by-step explanation:
In the equation of cost, we can see that each rose costs 3 and each petunia costs 2.5.
To find the total cost of two roses and four petunias, we can use the values r = 2 and p = 4 in the equation given, so:
Total cost = 3r + 2.5p = 3*2 + 2.5*4 = 6 + 10 = 16
So the total cost of two roses and four petunias is 16.
The numbers are 2, 2, 4, 5, 7
The equation

is quadratic, since the highest power of x is x^2. The quadratic term is -3x^2, the linear term is -29x, and the constant is 30.