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Bethany sells roses and petunias. The expression
3r+2.5 p gives the cost (in dollars) of
r roses and
p petunias.
What is the cost of 7 roses and 8 petunias?

$

Bethany sells roses and petunias. The expression $3 r+2.5 p$ gives the cost (in dollars) of $r$ roses and $p$ petunias. $\newline$ What is the cost of $7$ roses and $8$ petunias? $\newline$ $\$$

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Approximation percent word problems

Full solution

Q. Bethany sells roses and petunias. The expression

3 r+2.5 p

gives the cost (in dollars) of

r

roses and

p

petunias.

\newline

What is the cost of

7

roses and

8

petunias?

\newline

\$

Identify Given Expression: First, we need to identify the given expression for the cost of roses and petunias, which is $3r + 2.5p$ , where $r$ represents the number of roses and $p$ represents the number of petunias.
Substitute Given Numbers: Next, we substitute the given numbers of roses and petunias into the expression. For $7$ roses, we replace $r$ with $7$ , and for $8$ petunias, we replace $p$ with $8$ . The new expression becomes $3(7) + 2.5(8)$ .
Perform Multiplication: Now, we perform the multiplication for each term. Multiply $3$ by $7$ to get the cost for the roses, and multiply $2.5$ by $8$ to get the cost for the petunias. This results in $21 + 20$ .
Find Total Cost: Finally, we add the two amounts together to find the total cost. Adding $21$ (cost for roses) and $20$ (cost for petunias) gives us $41$ .

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