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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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Putting soil is sold in bags that contain 1/2 cubic foot of soil. Estimate how many bags Rylee should buy.
kap26 [50]

Answer:

Ok. So, I can't see the image. Buttttt, depending on how many cubic feet she wants. If she wanted 5.5 cubic feet of soil, she would buy 10 bags of soil. Each showing 1/2 of a cubic foot. Use your fingers to help saying, " Half, One, One and a half, two, two and a half...." So on and so forth.

Step-by-step explanation:

8 0
3 years ago
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The inventory of a store 2 years ago was worth $45,000. This year it is worth $49,500. What is the percent increase?
UkoKoshka [18]
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7 0
3 years ago
Solve using system of equations by using elimination method for -5x+4y=2 ; 9x-4y=6
jek_recluse [69]

Answer:

y = 3

x = 2

Step-by-step explanation:

-5x + 4y = 2

9x - 4y = 6

Sum both eq.

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2 + 6 = 8

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4x + 0 = 8

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x = 8/4

x = 2

from the first eq.

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from the second eq.

9x - 4y = 6

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6 0
2 years ago
Someone plz help me litterly no one would bother to help me so plz I beg of u due today
goldfiish [28.3K]

<h2><u>PLEASE MARK BRAINLIEST!</u></h2>

Answer:

I'm going to help youuuuu.

Step-by-step explanation:

{1}

Your answer is A) because the rise/run is -2/4x, which simplifies to -1/2x, which is <em>option A)</em>.

{2}

Dario's salary is <em>B) $12 per hour</em>. This is because, in 5 hours, Dario makes 60 dollars. If you find the unit rate of $60 in 5 hours, the answer is $12 per hour.

{3}

A) Between <em>x = -6</em> and <em>x = -2</em>

I hope this helps! I am sorry if any of these are incorrect!

- sincerelynini

8 0
3 years ago
3 ^(1 − 7 x = 7 ^x find the exact value
Shalnov [3]

Answer:

x

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Step-by-step explanation:

7 0
3 years ago
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