Answer:
67 the answer is 67 because u add it all up
One of the product rules for exponents was used.

Or, you can consider that the definition of an exponent and the associative and commutative properties of multiplication were used.
Is it asking you to tell them what the numbers that the letters substitute are??
If so o might be able to help with that
By the general application of cumulative property of addition :
x + y = y + x
For sure
Answer:
$304.63
Step-by-step explanation:
From the information provided, the total cost can be calculated by multiplying the price of each item for the amount purchased and adding up the results:
Total cost=($87.98*2)+($14.57*3)+($21.24*4)
Total cost=$175.96+$43.71+$84.96
Total cost= $304.63
According to this, the answer is that their total cost is $304.63.