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Lilit [14]
3 years ago
10

(-3√ -81)(-5+√ -9)+9i

Mathematics
1 answer:
AnnyKZ [126]3 years ago
5 0

Answer:

144i + 81

Step-by-step explanation:

(-3*9i)(-5 + 3i) + 9i

-27i (-5 + 3i) + 9i

FOIL

135i + 81 + 9i

144i + 81

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15pts<br> f(x)=(x+6)/2<br> g(x)=2x - 6<br> Show your work to evaluate g(f(x)).
notsponge [240]

Answer:

g(f(x)) = -x - 18

Step-by-step explanation:

2x - 6( (x + 6) / (2) )

2x - 3( x + 6)

2x - 3x - 18

-x - 18

4 0
3 years ago
If you save $700 and earn $3 interest for every $100, how much money will you have in all?
Margaret [11]

Answer:

721

Step-by-step explanation

700 divided by 100 is 7.

So you have 7 hundred and 7 times 3 is 21.

700+21=721

4 0
3 years ago
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What is -7(5x-4) simplifyed
HACTEHA [7]

Answer:

-35x+28

Step-by-step explanation:

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7 0
2 years ago
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How do you simplify 4^-2h^-4j^3
notka56 [123]
    j^3
_______
4^2 h^4

when you have negatives, you want them to be positive. To do that you need to convert it into a fraction
7 0
3 years ago
Anna’s cell phone plan charges her $30 per month plus a $150 one-time activation fee. Evelyn’s cell phone plan charges her $20 p
AveGali [126]

Given:

Anna’s cell phone plan charges her $30 per month plus a $150 one-time activation fee.

Evelyn’s cell phone plan charges her $20 per month, plus a $450 one-time activation fee.

To find:

The number of months after which the costs for the girls’ cell phone plans the same.

Solution:

Let x be the number of months.

Total cost = Fixed cost + Variable cost

According to the question, cost equation for Anna’s cell phone is

y=150+30x           ...(i)

Cost equation for Evelyn's cell phone is

y=450+20x         ...(ii)

Equate (i) and (ii) to find the time after which the costs for the girls’ cell phone plans the same.

150+30x=450+20x

30x-20x=450-150

10x=300

Divide both sides by 10.

x=\dfrac{300}{10}

x=30

Therefore, the costs for the girls’ cell phone plans the same after 10 months.

5 0
3 years ago
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