Let's say that the value invested in the account with a rate of 8% is "x", then the amount invested in the account with a rate of 12% is:

To calculate the total interest we need to calculate the interest of each individual account and sum them:

The total interest is the sum of the two expressions above:

The value invested in the account with 8% interest is 830, the one invested in the account with 12% interest is 1280.
Answer:
22.05 mi.²
Step-by-step explanation:
A = bh
A = (4.5 mi)(4.9 mi)
A = 22.05 mi.²
Sum of angle in a triangle is 180, so 33+70+x=180
x=77
x and y are vertical angles so y=77