Answer
19 (a) 15
(b) C = p + (n × $1)
(c) n = 4 toppings
Work Step by Step
19 (a) The cost of a 3-topping pizza is $$12 + (3 × $1)$. Which is equal to $15.
(b) C - cost of pizza
p - price of plain pizza
n - number of toppings
Therefore C = p + (n × $1)
(c) C = $16
p = $12.
n = ?
C = p + (n × $1)
$16 = $12 + (n × $1)
$16 - $12 = $12 - $12 + n × $1. (Subtract $12 from both sides of the equation)
$4 = n × $1
$\frac{$4}{$1} = n$
n = 4
