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coldgirl [10]
3 years ago
12

What is the value of the expression 2x2 + 3xy – 4y2 when x = 2 and y = - 4?

Mathematics
1 answer:
Bumek [7]3 years ago
5 0
Please use " ^ " to denote exponentiation:  <span>2x^2 + 3xy – 4y^2

Now let x=2 and y= -4:

2(2)^2 + 3(2)(-4) - 4(-4)^2 = 8 - 24 -4(16) = -16 - 4(16) = -5(16) = -80 (answer)</span>
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schepotkina [342]

Answer:  Choice B

There is not convincing evidence because the interval contains 0.

========================================================

Explanation:

The confidence interval is (-0.29, 0.09)

This is the same as writing -0.29 < p1-p1 < 0.09

The thing we're trying to estimate (p1-p2) is between -0.29 and 0.09

Because 0 is in this interval, it is possible that p1-p1 = 0 which leads to p1 = p2.

Therefore, it is possible that the population proportions are the same.

The question asks " is there convincing evidence of a difference in the true proportions", so the answer to this is "no, there isn't convincing evidence". We would need both endpoints of the confidence interval to either be positive together, or be negative together, for us to have convincing evidence that the population proportions are different.

5 0
3 years ago
Abbey purchased a poster that had a height of 2 feet and a width of 0.7 foot.What is the area of Abbey's poster?
Eduardwww [97]

Answer:

1.4 feet

Step-by-step explanation:

To determine area we multiply height X width

2 X .7 = 1.4

6 0
3 years ago
Question down below¡
lutik1710 [3]
Pattern A starts with 20 and substracts 3
First number = 20
Second number = 20 - 3 = 17
Third number = 17 - 3 = 14
Fourth number = 14 - 3 = 11

Pattern B starts with 10 and adds 2
First number = 10
Second number = 10 + 2 = 12
Third number = 12 + 2 = 14
Fourth number = 14 + 2 = 16

Now join pattern A and B
First combination = (20,10)
Second combination = (17,12)
Third combination = (14, 14)
Fourth combination = (11, 16)

The answer is d. (20,10), (17,12), (14,14), (11,16)
3 0
2 years ago
Marlow wants to know how many students in his school enjoy watching the TV news. He asks all 27 students in his art class and fi
Pachacha [2.7K]
He is not making a valid inference because he is assuming the student populations interest based on a small part/ group of the student population, his class.
6 0
3 years ago
Sarah had a bag of 16 marbles that are green and yellow. The number of yellow marbles is 2 less than double the number of green
Alex777 [14]

Answer:

10 yellow marbles

Step-by-step explanation:

(y is the amount of yellow marbles)

y=2x-2

y=2(6)-2

y=12-2

y=10

8 0
3 years ago
Read 2 more answers
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