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Dovator [93]
3 years ago
7

20 POINTS!!!!

Mathematics
1 answer:
koban [17]3 years ago
3 0

Answer:

The correct answer is d. (40, 60)

Step-by-step explanation:

To start using the linear combination method, you need a variable that will cancel out. To get this, we will multiply the second equation by -20 and then add together.

x + y = 100

-1.4x - y = -116

-----------------

-0.4x = -16

x = 40

Now that we have the value of x, we plug into one of the original equations to find y.

x + y = 100

40 + y = 100

y = 60

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How do you answer this question
GaryK [48]

Answer:

9x^2 -4

Step-by-step explanation:

(3x+2) (3x-2)

FOIL

first: 3x*3x = 9x^2

outer: 3x*-2 = -6x

inner: 3x*2 = 6x

last: -2*2 = -4

Add together

9x^2 -6x+6x -4

9x^2 -4

6 0
3 years ago
Read 2 more answers
Which represent geometric sequences? check all that apply.
Shtirlitz [24]

Only three are geometric sequences, a which is 3/16, 3/8, 3/4, 3/2, d which is 3,9,27,81 and f which is -4(4/9)^x

<h3>What is a geometric sequence?</h3>

A geometric sequence is a sequence of numbers or functions in which successive member differ by a constant term called the common ratio.

Analysis:

For a, the first term is 3/16, second term is 3/8. if we divide the second term by the first we have 2. If we do same with the third and second we still have 2. so this is a geometric sequence

For d, if we divide 9 by 3 we have 3, if we divide 27 by 9 we have 3. so this is a geometric sequence.
For f, if we make x equal to a nonzero integer, we have first term as -16/9, second term as -64/81 and third term as -256/729. if we divide the second term by the first we have -4/9, if we divide the third by the second we have-4/9.

In conclusion, Only three are geometric sequences, a which is 3/16, 3/8, 3/4, 3/2, d which is 3,9,27,81 and f which is -4(4/9)^x

Learn more about geometric sequence: brainly.com/question/9300199

#SPJ1

6 0
2 years ago
Which set of real numbers only contain integers?
a_sh-v [17]

Answer:

3. 2/9,2,0

Step-by-step explanation:

(2/9,2,0,-7)

4 0
3 years ago
Work out: 6 divided by 3/5
Eva8 [605]
= 0.4 
because...
if you divide 6 by 3 it gives you 2.
then....
divide 2 by 5 and the answer is 0.4
6 0
3 years ago
Read 2 more answers
4x(x + 3) +7x = what is the answer please
wel
4x^2+12x+7x
4x^2+19x

Was it meant to equal something or are you just simplifying the equation?
5 0
3 years ago
Read 2 more answers
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