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ch4aika [34]
3 years ago
14

Someone please help a) Solve the problem correctly by completing the square.

Mathematics
2 answers:
jolli1 [7]3 years ago
5 0

Answer:

X=4/7

Step-by-step explanation:

Firlakuza [10]3 years ago
4 0

Answer:

Step-by-step explanation:

x^2-4/7x-12/49=0

x= 6/7 and -2/7

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A grab bag contains 4 football cards and 6 basketball cards. An experiment consists of taking one card out of the bag, replacing
Zinaida [17]
Total Number of cards = 4 + 6 = 10
Number of Football cards = 4
Number of Basketball cards = 6

Probability of choosing a football card = 4/10 = 0.4
Since this card is replaced, the total number of cards will remain the same.

Probability of selecting a basketball card = 6/10 = 0.6

Since, the two events are independent, the probability of selecting a football and a basketball card will be the product of two probabilities we calculated. 

Thus, probability of selecting a football card and then a basketball card = 0.4 x 0.6 = 0.24
5 0
3 years ago
Read 2 more answers
When rolling a number cube 600 Times, predict the relative frequency of rolling a 3 or 6
Flauer [41]

Answer:

The frequency of rolling a 3 or a 6 would be the same even if you try thousands or millions times.

The probability of rolling a 3 is: 1/ total outcomes probability = 1/6

The probability of rolling a 6 is: 1/ total outcomes probability = 1/6

The probability of rolling a 6 or a 3 = 2/ total outcomes probability = 2/6 = 1/3

Therefore, if you rolling the cube 600 times, the probability of rolling a 3 or a 6 is still 1/6. If 3 and 6 are both allowed, the probability would become 1/3

Hope this helped :3

7 0
3 years ago
Find the roots x^2-13x+30=0<br> (numbers only)
Morgarella [4.7K]

Answer:

Find the roots of x^2-13x+30=0 by solving for x

x= 10,3

Step-by-step explanation:

3 0
2 years ago
Find the values of x and y.
vova2212 [387]

Look at the picture.

We have the equation (1) 12x + 4y = 40.

We know, the sum of the acute angles in a right triangle is 90°.

Therefore we have the equation (2) (12x + 4y) + (17x - y) = 90

Substitute (1) to (2):

40 + 17x - y = 90        <em>subtract 40 from both sides</em>

17x - y = 50   (3)

We have the system of equations:

\left\{\begin{array}{ccc}12x + 4y = 40&|:4\\17x-y=50\end{array}\right\\\underline{+\left\{\begin{array}{ccc}3x + y = 10\\17x-y=50\end{array}\right}\ \text{add both side of equations}\\.\qquad20x=60\qquad|:20\\.\qquad x=3

Substitute the value of x to (3)

17(3)-y=50\\51-y=50\qquad|-51\\-y=-1\to y=1

Answer: x = 3 and y = 1.

4 0
2 years ago
The hanger image below represents a balanced equation
kolezko [41]

Answer:

h+7+20

h=13

Step-by-step explanation:

To find 7+ what ='s 20 i just added 13 bc 13+7=20

5 0
3 years ago
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