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Amanda [17]
3 years ago
14

If x = (10 − 3i) and y = (3 − 10i), then xy= and xy=

Mathematics
2 answers:
Darina [25.2K]3 years ago
5 0

Answer:

xy = -109i

Step-by-step explanation:

Given that:

x = 10 - 3i

y = 3-10i

where, i is the imaginary part

We have to find xy.

xy=(10-3i)(3-10i)

⇒(10-3i)(3-10i) = 30-100i-9i+30i^2

We know that: i^2 = -1

then;

⇒(10-3i)(3-10i) = 30-100i-9i-30=-109i

⇒xy =-109i

therefore, the product of x and y is, -109i

kipiarov [429]3 years ago
4 0

xy=(10-3i)(3-10i)=30-100i-9i-30=-109i

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84 divided into sevenths could either be:

84 x (1/7) or simply 84/7
In the end, the answer would be 12. 
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3 years ago
Kyla has the number of cherries that Denise has. If Kyla has 46 cherries, how many cherries do they have altogether?​
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Answer:

92

Step-by-step explanation:

46 + 46 = 92

5 0
2 years ago
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T-shirts are sold in packages of 4.The store’s 139 employees will each be given 5 t-shirts. How many packages will the store nee
Novosadov [1.4K]

Answer:

174 packages of t-shirts    PLEASE GIVE BRAINLIEST

Step-by-step explanation:

139 x 5 = 695 t-shirts are needed

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174 packages

8 0
3 years ago
Simultaneous equations<br> x^2+3xy=10<br> x=2y
satela [25.4K]

9514 1404 393

Answer:

  (x, y) = (-2, -1) or (2, 1)

Step-by-step explanation:

Substitute for x in the first equation:

  (2y)^2 +3(2y)y = 10

  10y^2 = 10

  y^2 = 1

  y = ±1

  x = 2y = ±2

Solutions are (x, y) = (-2, -1) or (2, 1).

8 0
3 years ago
This makes no sense to me keep getting the wrong answers when i try to figure it out
satela [25.4K]
To solve this problem, you'd want to start by finding the mean of the given numbers. To find the mean, add all the numbers together and divide by how many there are.

Next, you'll see that the question says one of the rents changes from $1130 to $930. So find the mean of all the numbers again, except include $930 in your calculation instead of $1130.

I got $990 as the mean for the given numbers, and $970 as the mean after replacing the $1130 with $930. Subtracting the two means gives you $20. So the mean decreased by $20.

Now for the median, all you need to do is find the median of the given numbers and compare them with the median of the new data. Because there are ten terms, you have to add the middle two numbers and divide by two. $990 + $1020 = 2010. 2010÷2 = $1005 as the first median.

The new rent is 930, so you have to reorder the data so it goes from least to greatest again. 745, 915, 925, 930, 965, 990, 1020, 1040, 1050, 1120. After finding the median again you get 977.5. Subtracting the two medians gives you $27.5 as how much the median decreased. Hope this helps!
4 0
3 years ago
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