Answer:
6m-mn, or 5m-n.
7y+42+5y+30, or 12y+72.
Not sure exactly what you're asking for the third and fourth, but these are the first two simplified.
Answer:
a=-11
b=11
c=22
d=44
Step-by-step explanation:
The answer should most likely be A. I think
Answer:
She will have $2792 at the end of her four year investment
Step-by-step explanation:
The compound interest formula is given by:

Where A(t) is the amount of money after t years, P is the principal(the initial sum of money), r is the interest rate(as a decimal value), n is the number of times that interest is compounded per year and t is the time in years for which the money is invested or borrowed.
Gift of $2500:
This means that 
She shopped around and found a 4 year GIC investment that earns 2.8% interest annually.
This means that
.
How much will Anna have at the end of her four year investment?
This is A(4). So


She will have $2792 at the end of her four year investment