Use a grid to complete this problem. let the side length of each small square on the grid represent 1/2 unit. Draw two different triangles, each with a base of 5 1/2 and area 19 1/4 square units. Why does each of your triangles have area of 19 1/4 square units. Explain or show your reasoning.

b.

step-by-step explanation:

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answer is b  

20

hope you get this one right.

answer: $53750

steps:

list the principal and interest after the n-th year:

n       principal   simple interest

1     12500     375

2     25000     750

3     37500     1125

4     50000     1500

sum: $50000     $3750

total at end of year 4: $53750