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Rus_ich [418]
3 years ago
13

This is a sat practice. need help ​

Mathematics
2 answers:
Mila [183]3 years ago
5 0
So you would have

(7+3i)+(-8+9i)

You go ahead and rewrite it like this

7-8+3i+9i

And then combine like terms

-1+12i

So your answer is A
nadya68 [22]3 years ago
4 0

Answer:

The answer is A) -1 + 12i

Step-by-step explanation:

(7 + 3i) + (-8 + 9i)

(7 - 8) + (3 + 9)i

7 - 8 = - 1

3 + 9 = 12

- 1 + 12

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A circle is centered at (-4, 6) and has a radius of 9. What is the equation of the circle? Question 3 options: (x+4)2+(y−6)2=18
Lera25 [3.4K]

Answer:

(x+4)² + (y-6)² = 81

Step-by-step explanation:

<u>General equation of a circle :</u> (x-h)² + (y-k)² = r²

where (h,k) is at center and r = radius

Here we are given that the circle has a center at (-4,6) and a radius of 9

So we have (h,k) = (-4,6) so h = -4 and k = 6 and radius = 9 so r = 9

<u>Plugging in values into general equation</u>

Recall that the general equation of a circle is (x-h)² + (y-k)² = r²

we have h = -4 , k = 6 and r = 9

==> plug in values

doing so we acquire (x-(-4))² + (y-6)² = 9²

==> apply double negative sign rule

(x+4)² + (y-6)² = 9²

==> evaluate exponent

(x+4)² + (y-6)² = 81

And we are done!

3 0
2 years ago
What is the product of 7/8 and 14
Shtirlitz [24]
I believe it is 12 1/4 or 1/16
3 0
3 years ago
Read 2 more answers
Quadratic equation x² - 5x+6=0
Nadusha1986 [10]

Answer: X=6-1

Step-By-Step Equation:

6 0
3 years ago
A fair coin is tossed 3 times in a row. What is the probability that heads appears on only the last toss?
zlopas [31]
3/4 is your answer 

it is D
8 0
4 years ago
10+11+12+13+14+15+16+17+18+19+200000000-19
Nutka1998 [239]

Answer:

200000126

Step-by-step explanation:

7 0
3 years ago
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