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sdas [7]
4 years ago
12

Solve the linear equations -2x+5y=39 2x-3y=-25

Mathematics
1 answer:
nata0808 [166]4 years ago
4 0

Answer:

Step-by-step explanation:

hello :

-2x+5y=39 ....(*)

2x-3y=-25....(**)

add(*) and (**) : 2y =64    so : y =64/2 =  32

put this value in (*) : -2x+5(32) = 39 ....continu

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Express the product of 3x^2-x+7 and x+5 in standard form.
Darina [25.2K]

Answer:

  3x^3 +14x^2 +2x +35

Step-by-step explanation:

The distributive property is used to find the product of polynomials. Terms can be collected to express the result with terms in order of decreasing degree.

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  (3x^2 -x +7)(x +5)

  = x(3x^2 -x +7) +5(3x^2 -x +7) . . . . apply the distributive property

  = (3x^3 -x^2 +7x) +(15x^2 -5x +35) . . . . show the products

  = 3x^3 +(-1 +15)x^2 +(7 -5)x +35 . . . . . collect like terms

  = 3x^3 +14x^2 +2x +35 . . . . . . . . write in standard form

3 0
2 years ago
What is the probability of flipping a coin 10 times and getting heads four times Rania answer to the nearest 10th of a percent
EleoNora [17]

Answer: 0.205

Step-by-step explanation:

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Now, if we do 10 flips, we want 4 times that the coin ends in heads and the other 6 times it must end in tails, so the probability is:

0.5^4*0.5^6 = 0.5^10

Now, this is the case where in the first 4 flips we get heads and in the other 6 we get tails, but we have other ways to get only 4 heads (for example in the last 4 flips, 2 at the beginning and 2 at the end, etc)

So we also need to calculate all the possible permutations of 4 heads in 10 flips. this is:

C = 10!/(10 - 4)!*4! = (10*9*8*7)/(4*3*2*1) = 210

So the probability that we are looking for is:

P = (0.5^10)*210 = 0.205

4 0
4 years ago
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Step-by-step explanation:

what do you need to create ?

g - 3 > 17

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that is all I can see for your very limited problem description.

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2 years ago
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Vlad1618 [11]

Answer:

ok

trough is the y

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I put a picture for help

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3 years ago
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saw5 [17]

Answer:

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Step-by-step explanation:

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3 years ago
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