Bethany sells roses and petunias. the expression 3 r + 2 . 5 p 3r+2.5p3, r, plus, 2, point, 5, p gives the cost (in dollars) of r rr roses and p pp petunias. what is the cost of 7 77 roses and 8 88 petunias?

For this case we have the following expression:
 
 Where,
 r: number of roses
 p: number of petunias
 We want to find the cost of 7 roses and 8 petunias
 Therefore, we must replace the following values:
 
 Substituting the values in the given equation we have:
 
 
 the cost of 7 roses and 8 petunias is $ 41