He needs to take the LCM of 15 and 10. ( LCM = 30 )
15 × 2 = 30
10 × 3 = 30
Therefore,
Dan has to buy -
3 packets of sausages
AND
2 packets of bread rolls
Answer:

Step-by-step explanation:
Please see the attached picture for the full solution.
The fish at 4 feet below is at -4
The fish at 3 feet below is at -3
-3 > -4
For an exponential function the y-intercept is the "initial value" (not the common ratio).

will always be 2. if that's what you need
note that

because anything to the power of zero equals 0 (mathematically it's deciding something by itself)