Answer:
and
Step-by-step explanation:
Required
y, when they are equal.
To do this, we set them to another
Square both sides
Expand
Collect like terms
Using quadratic formula
3 cookies= 240 cal
∴ 1 cookie= 240÷3 cal
∴ 5 cookies= (240÷3) × 5
⇒ 240÷3= 80
⇒ 80 × 5= 400
[ans] 400 cal