Question

glazed donut shop has a special deal going on. the more cups of coffee a customer buys, the more free donut holes they get. the table below shows the number of donut holes the customer gets, $d$, based on the number of cups of coffee they buy, $c$.
input ($c$) output ($d$)
1 4
2 5
3 6
4 7
write an equation that describes the relationship between $c$ and $d$.
$d = \square$
submit
work it out
not feeling ready yet? these can help:
input/output tables: find the rule (83)
compare patterns

Explanation:

Step1: Identify pattern difference

Calculate $d - c$ for each pair:
$4-1=3$, $5-2=3$, $6-3=3$, $7-4=3$

Step2: Rearrange to solve for d

Isolate $d$ using the constant difference:
$d = c + 3$

Answer:

$d = c + 3$