How do I solve this - 5i (-1-8i) ^2

The relationship between voltage, E, current, l, and resistance, Z, is given by the equation E=IZ. If a circuit has a current l=3 + 2i and a resistance Z=2 - i, what is the voltage of the circuit?

A shop sells candles in 3 boxes for $12.60 each or 1 candle for $5.50. How much do 8 candles cost?

Graham's monthly bank statement showed the following deposits and withdrawals: $-25.20, $52.75,$-22.04,$-8.50,$94.11 If Graham's balance in the account was $47.86 at the beginning of the moth what was the account balance at the end of the month?

Out of 100 students sampled, 70 of them said that they hoped to get married someday. With 95% confidence, what is the approximate percentage of the students in the population who hope to get married someday?

Which is a statistical question? 1.) How many touchdowns did you score in yesterday's game? 2.) How many pens are inside each of my classmates' desks? 3.) How many balloons came in the package that you bought? 3.

A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporters data is valid or not?

I am very confused on how to figure out if y = 3/4x is proportional?

Alison wants to buy a mountain bike for $339.12. If she saves $28.26 each month, in how many months will she be able to buy the bike?

At 12 o'clock the temperature was 7°C. The temperature decreased by - 20°C. What is the new temperature?

Ashleys rentals charges $27.50 per hour to rent a surfboard and a wetsuit. Darlas surf shop charges $23.25 per hour to rent a surfboard plus $17 extra for a wetsuit.