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2 years ago

Zad. 3 str. 96 (matematyka z kluczem nowa era

Mathematics

1 answer:

barxatty [35]2 years ago

4 0

Answer:

1. 9 2. 5 3. Brak rozwiązania 4. 5 5. Brak rozwiązania

Step-by-step explanation:

1. 2 * x - 4 = x + 5 x = 9

2. 15/x + 4 = x + 2 x = 5

3. x + 3 = 5 x = 2

4. ( x - 2 ) * ( x + 3 ) =24 x = 5

5. x + 3 = x +7 Brak rozwiązania

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You have $284 in your credit card balance. 186-174= 12. 99+35= 134 and then 12-134= -122. So 406-122= 284.

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2 years ago

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A single carton of juice costs $4.20. A special offer pack of 3 cartons costs $9.45. Ali bought a special offer pack instead of

fgiga [73]

1 cartons of juice = $4.20

3 single cartons = 4.20 * 3 = $12.60

1 pack = $9.45

He saved 12.60 - 9.45 = $3.15

So, he saved $3.15, compared to the total ($12.60)

To calculate the percentage, we will do a proportion:

3.15 (money saved) : 12.60 (total of 3 single cartons) = x (how much percentage) : 100 (total)

3.15 : 12.6 = x : 100

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So the percentage saving is 25%

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2 years ago

Which are the solutions of x2 = –5x + 8? StartFraction negative 5 minus StartRoot 57 EndRoot Over 2 EndFraction comma StartFract

serg [7]

Answer:

$x=\frac{-5-\sqrt{57} }{2}\ or\ x=\frac{-5+\sqrt{57} }{2}$

Step-by-step explanation:

Given:

The equation to solve is given as:

$x^2=-5x+8$

Rearrange the given equation in standard form $ax^2+bx +c =0$ , where, $a,\ b,\ and\ c$ are constants.

Therefore, we add $5x-8$ on both sides to get,

$x^2+5x-8=0$

Here, $a=1,b=5,c=-8$

The solution of the above equation is determined using the quadratic formula which is given as:

$x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

Plug in $a=1,b=5,c=-8$ and solve for $x$ .

$x=\frac{-5\pm \sqrt{5^2-4(1)(-8)}}{2(1)}\\x=\frac{-5\pm \sqrt{25+32}}{2}\\x=\frac{-5\pm \sqrt{57}}{2}\\\\\\\therefore x=\frac{-5-\sqrt{57} }{2}\ or\ x=\frac{-5+\sqrt{57} }{2}$

Therefore, the solutions are:

$x=\frac{-5-\sqrt{57} }{2}\ or\ x=\frac{-5+\sqrt{57} }{2}$

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2 years ago

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Answer:

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2 years ago

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galben [10]

F(x)=1-x² and g(x)=√(11-4x)

(g+f)(2)=>

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=√3-3

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√(11-4*-1)-(1-(-1)²

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(g×f)(2)

1-(2)²×√(11-4(2))

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2 years ago