Start by expanding the first two brackets
(2+i)(3-i)
Multiply 2x3=6, then 2x I = 2i, then i x 3= 3i, then i x i= i2( i squared)
so it will be written as 6+2i+3i+i2( squared)
from here you can see that 2i and 3i can be added together to make 5i
so, 6+5i+i2(squared)
Then you bring in the third bracket from the question.
(6+5i+i2)(3+i)
6 x 3=18
6 x i= 6i
5i x 3=15i
5i x i=5i2(squared)
2x3=6
2x i= 2i
so you get 18+6i+15i+5i2(squared)+6+21
6i and 15i can be added together
18, 6 and 21 can be added together
so, 21i+5i2(squared)+45
Yh and then what the next part? We need to know what we supposed to answer
Answer:
23 pounds and 9 ounces (23lb 9 oz)
Step-by-step explanation:
You can add the pounds together and the ounces together separetly. As long as the ounces are less than 16 (since 16 ounces=1 pound), you wont hvae to convert those ounces into pounds. So you can simply add the numbers up to get 23 pounds and 9 ounces
If the ending time was 10:35 and 45 minutes passed:
35 - 45 = -10 that does not work. Sooo, what we are going to do is take away 36.
So instead of 10:35, we have 9:59, and instead of 45, we have 9.
59 - 9 = 50
So our answer is: 9:50 was the start time