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Zinaida [17]
2 years ago
13

X(x+1)-1=4 --- please help stuck on this question

Mathematics
2 answers:
Sloan [31]2 years ago
8 0

Answer:

x=2

Step-by-step explanation:

use distributive property: x^2+2x-1=4

remove the -1 by adding 1 on both sides: x^2+2x=5

use the guadratic fromula:  ax²+bx+c=0

plug in the equation x^2+2x-5=0

a,b and c are the coefficients to plug into the formula

a=1, b=2, c=-1

Finally, you will find that x=2

Gelneren [198K]2 years ago
4 0

Answer:

21

Step-by-step explanation:

math

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An alloy consists of nickel, zinc, and copper in the ratio 2:7:9.
Alexus [3.1K]

Answer:

0.4kg, 1.4kg and 1.8kg

Step-by-step explanation:

Given parameters:

         Mass of alloy = 3.6kg

         Ratio of elements in the alloy = 2:7:9

Unknown:

Mass of each element in the alloy = ?

Solution:

To find the mass of each element in the alloy, first find the sum of the ratio;

              2+7+9 = 18

Mass of nickel  = \frac{2}{18} x 3.6 = 0.4kg

Mass of zinc = \frac{7}{18} x 3.6 = 1.4kg

Mass of copper = \frac{9}{18} x 3.6 = 1.8kg

The mass of each metal is 0.4kg, 1.4kg and 1.8kg

5 0
3 years ago
Which of the following has the greatest x value for the vertex?
FinnZ [79.3K]
The great x value for what? Can you give us the equation?
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A salesperson earning a 22% commission takes home $1,200 as a commission. What was the dollar value of the items she sold?
kherson [118]

Answer:

5333 i believe

Step-by-step explanation:

5 0
2 years ago
Which of the following linear equations has the steepest slope?
Romashka [77]
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In the past month Melissa went to buy video games and 7 DVD the rental price for each video game was $3.10 the rental price for
hammer [34]
Hi! I’m here to help you with your math.

You didn’t specify how much games so let’s go with one, if it’s not 1 I can always change it later!

1 * 3.10 is 3.10 (duh)

7 * 3.70 is 25.90

7
3 7 0
0 0 0 0
— — — — — —
4 9
2 1
— — — — — —
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Add the decimals in the correct places and you’ll get 25.90.

Now add 25.90 + 3.10 and you shall get your answer, 29!

Melissa spent 29$ for the rentals in the past month.

Thank you and I hope this helped.
4 0
2 years ago
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