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andrew11 [14]
3 years ago
10

What is the simplified form of (- 7+ 8i) - (- 5i + 4i?)?

Mathematics
2 answers:
ruslelena [56]3 years ago
6 0

Answer: 7-

Step-by-step explanation:

WARRIOR [948]3 years ago
4 0

Answer:

9 i - 7

Step-by-step explanation:

Simplify the following:

-7 + 8 i - (-5 i + 4 i)

Hint: | Combine like terms in -5 i + 4 i.

-5 i + 4 i = -i:

-7 + 8 i - -i

Hint: | Multiply all instances of -1 in -(-i).

(-1)^2 = 1:

-7 + 8 i + i

Hint: | Add the numbers in -7 + 8 i + i together.

Add like terms. -7 + 8 i + i = -7 + 9 i:

Answer: 9 i - 7

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Can someone help me how would you eliminate the “y”
saw5 [17]

Answer:

Multiply by 3 -> 3(x - y = 6)

Step-by-step explanation:

Cuz since the 2nd is positive 3y

u need a negative 3y to get rid of it

3(x - y = 6)

2x + 3y = 7

3x - 3y = 18

2x + 3y = 7

5x/5 = 25/5

x = 5

5 - y = 6

-5          -5

-y/-1= 1/-1

y = -1

(5,-1)

8 0
3 years ago
The diagram shows a solid which is half of a cone. Calculate the total surface area of the solid.
Vilka [71]

Answer:

<h2>100πcm².</h2><h2>None of the options is correct</h2>

Step-by-step explanation:

Total surface area of a cone S = \pi r^{2}+\pi  rl\\

Since the diagram is half of a cone, its surface area will be S = \frac{\pi r^{2} +\pi rl}{2}

r = radius of the cone

l = slant height

From the diagram diameter of the cone = 16m;

r = 16/2 = 8m

l = 17m

S = \frac{\pi (8)^{2} +\pi (8)(17)}{2}\\S = \frac{64\pi + 136\pi }{2} \\S = 32\pi + 68\pi \\S = 100\pi cm^{2}

5 0
3 years ago
Julie spent 2/3 of an hour running and 5/6 of an hour swimming. How much longer did she swim than run?
aniked [119]
Running = 2/3

Swimming = 5/6

5/6 - 2/3 = 5/6 - 4/6 = 1/6

Answer : She spent 1/6 hour longer swimming than running.
4 0
3 years ago
Read 2 more answers
The local sales tax is 8% if a pair of shoes sells for $140 what is the cost after tax
lbvjy [14]

Answer:

$151.2

Step-by-step explanation:

To find the price after the tax is implemented,

set a relationship x/140=8/100 (8/100) basically means 8%.

cross multiply (140)(8)=1120. Then divide it by 100x, you get $11.2.

But that's just 8 percent of the total amount. So you need to add onto the original price, 140+11.2=$151.2.

8 0
3 years ago
let x represent the number of years since 2000. let f(x) represent the population of the state you picked in year x. find the y-
s344n2d4d5 [400]

Answer:

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Step-by-step explanation:

7 0
4 years ago
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