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3 years ago

Another math problem, i really, really need help with this one -4x^2-3+4+3-5y^2+3y^2-5y^2

Mathematics

2 answers:

VLD [36.1K]3 years ago

4 0

Answer:

-4x*2 - 7y*2 + 4

Step-by-step explanation:

simplify by adding/subtracting the like terms

olga nikolaevna [1]3 years ago

4 0

Answer:

-4x^2 +4 -7y^2

Step-by-step explanation:

If you are talking about simplifying you would need to combine like terms. It isn't really hard, just combining like terms. It could be like this:

4x^2 (Stays the same because there are no other like terms for it.)

-3+4+3= -3+7=4

-5y^2 +3y^2 -5y^2 = -2y^2 -5y^2 = -7y^2

So it would be 4x^2 +4 -7y^2

I hope this helps, I am not sure if this is what you need.

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Seee the attachment photo plz

Ray Of Light [21]

Answer:

not sure

Step-by-step explanation:

7 0

2 years ago

. Let X and Y be random variables of possible percent returns (0%, 10%,

bazaltina [42]

(a) The marginal distribution of X is

Pr(X = x) = ∑ Pr(X = x, Y = y)

… = 0.0625 + 0.0625 + 0.0625 + 0.0625

… = 0.25

That is, the first equality follows from the law of total probability, with the sum taken over y from {0, 5, 10, 15}. Each probability Pr(X = x, Y = y) is given in the table to be 0.0625.

Similarly, the marginal distribution of Y is

Pr(Y = y) = 0.25

(b) Yes, they're independent because

Pr(X = x, Y = y) = 0.0625,

and

Pr(X = x) Pr(Y = y) = 0.25 • 0.25 = 0.0625.

E[X] = ∑ x Pr(X = x)

… = 0.25 ∑ x

… = 0.25 (0 + 5 + 10 + 15)

… = 7.5

and you would find the same mean for Y,

E[Y] = 7.5

The variance of X is

V[X] = E[X^2] - E[X]^2

… = (∑ x^2 Pr(X = x)) - 7.5^2

… = 0.25 (∑ x^2) - 56.25

… = 0.25 (0^2 + 5^2 + 10^2 + 15^2) - 56.25

… = 31.25

and similarly,

V[Y] = 31.25

(each sum is taken with x and y from {0, 5, 10, 15})

7 0

3 years ago

15. (3x + 6) - (3x - 6)

coldgirl [10]

Answer:

Step-by-step explanation:

Distribute the negative which would get your 3x + 6 -3x + 6. The 3x would cancel out and you would add 6+6 = 12

6 0

3 years ago

Read 2 more answers

What do you think about when you hear the phrase "system of equations"? In other words, what do you already know about systems o

Reptile [31]

Basically the question is asking YOU when you hear “system of equations” what do you think about it - what do you already know about system of equations. Basically. Btw enjoy this picture.

4 0

2 years ago

Find the solution of this system of equations.

vagabundo [1.1K]

I'm going to use the substitution method.

4x + 4y = -16
-8x - 6y = -20

4x + 4y = -16
- 4x - 4x
--------------------------
4y = -4x - 16
------ ------ ------
4 4 4

y = -x - 4

-8x - 6(-x - 4) = -20
-8x + 6x + 24 = -20
-2x + 24 = -20
- 24 - 24
----------------------------
-2x = 44
------- -------
2 2

x = 22

4(22) + 4y = -16
88 + 4y = -16
- 88 - 88
------------------------
4y = -104
------ ---------
4 4

y = -26

The answer is (22, -26).

4 0

3 years ago