Answer: 
Step-by-step explanation:
You know that 1 sandwich costs $4.60 and the school bought 47 sandwiches.
Therefore, in order to calculate the total cost of 47 sandwiches, you need to multiply this number of sandwiches bought by the schoole, by the cost of 1 sandwich. Then:

You know that 1 bag of chip costs $1.25 and the school bought 39 bags of chips.
So, in order to calculate the total cost of 39 bags of chips, you must multiply the total number of them bought by the school, by the cost of 1 bag of chips.
Then:
Therefore, the total amount school spent was:

Answer:

Step-by-step explanation:
Assuming you are supposed to simplify:

Then we need to apply the product rule of indices.

So we multiply to get:

We now simplify the exponents to get:

Therefore the required product is

0.25 is 1/4 if that's what youre asking, i'm not sure,
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a ) Two matrices cannot be multiplied.
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b )
The answer is | 20 - 4 - 12 |
| 8 2 19 - |
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Answer:
11xy^4(y+7x)
Step-by-step explanation: