Answer:
Step-by-step explanation:
a). =
=
= [Since, i = ]
b). =
=
= 5 ± 2i [Since, i = ]
c). =
=
=
= [Since, i = ]
Convert the fractions so they both have the same denominator (bottom part of the fraction)
1/5 = 7/35
This is because 5*7=35, so 1*7=7
1/7 = 5/35
This is because 7*5=35, so 1*5 =5
Then subtract the top numbers to get the answer:
A. 70+1.25t
b. Plug in 650 for t
70+1.25(650)
70+812.5
882.5
Final answer: $882.50