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finlep [7]
2 years ago
6

Rewrite the equation by completing the square 4x^2 +28x +49=0

Mathematics
1 answer:
Elodia [21]2 years ago
5 0

Answer:  −3.5

Step-by-step explanation:

Standard form:

4x2 + 28x + 49 = 0

Factorization:

(2x + 7)2 = 0

Answer equation: 2x + 7 = 0  ⇒ x1 = x2 = −7  over 2   = −3.5

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Can someone solve this with an explanation?
Readme [11.4K]
The correct answer is C

5 0
3 years ago
Check all subsets the number belongs to:
Shkiper50 [21]

Answer:

integer natural and whole

Step-by-step explanation:

well oviously a integer because its a number and a natural i beleve because its not owned by any brakets such as a divide a multiply or a negitive so its naturalcand whole because ist a whole number and not split with fractions

8 0
3 years ago
Corey gave the cashier a $100 bill for 4 amusement park tickets. The cashier gave him $26.80 change. If each ticket cost the sam
Travka [436]

Answer:

$18.30

Step-by-step explanation:

100 - 26.80 = 73.20

73.20 / 4 = 18.30

4 0
3 years ago
PLZZZZZZ HELP ME WITH 10 QUESTIONS PLZZ 1. Stefan is measuring the angles of a triangle. He measures the first angle and gets a
Levart [38]
For question 1 and 2, you should keep in mind that the sum of all angles in a triangle is 180°. 

1. If the measure of one angle of a triangle is 90 degrees, you can assume that the sum of the other two triangles should be 90 degrees. Because

180 - 90 = 90

They do not necessarily have to be both 45 degrees. So your answer would be C, their measure should add up to 90 degrees.

2. There are two angles measured: 100° and 30°. Remember the sum of all angles of a triangle is 180°.

180° = 100° + 30° + X

To get X, you transpose the 100° and 30° to the other equation and it will look like this:

180° - 100° - 30 °= X

Remember when you transpose, you use the opposite operation used. 

By following the steps, you can now solve for the missing angle. So your answer to this question is A.

As for number 3, without the figure, it is not possible to solve. 

For number 4, just remember that trapezoid angles should sum up to 360°.

Given that  m∠A = ?; m∠B = 25°; m∠C = 155°; and m∠D = 117° these should all add up to 360°. Let's write an equation for it:

m∠A + m∠B + m∠C + m∠D = 360°

X + 25° + 155° + 117° = 360°

Add up what you know first then we can derive the missing from what is given:

X +  297° = 360°

Transfer the 297° to the other side of the equation and subtract.

X = 360° - 297°
   = 63°

Your answer is then B. 

For number 5, without the figure, it cannot be answered.

For number 6, 7  and 8 we can use the Triangle Inequality theorem to determine if the given sides form a triangle. It states that the sum of 2 sides of a triangle should be greater than the other side. 

a + b > c         b + c > a       a + c > b

If all three conditions are met rule then you have a triangle. Now let's use your given.

6. a = 13in   b=16in and c= 24 in

Let's do this one after the other:
a + b > c                 b + c > a                 a + c > b
13 + 16 > 24           16 + 24 > 13           13 + 24 > 16 
29 > 24                    30 > 13                   37 > 16                   

Because all three conditions were met, then we can say that a triangle can be found. The answer is A.

7. a = 24.3m       b = 7.4m      c=5.9m

a + b > c                 b + c > a               
24.3 + 7.4 > 5.9     7.4 + 5.9 > 24.3    
31.7 > 5.9               13.3 > 24.3 False                                  

Because b+c is less than a, we can say that the given does not make a triangle. Your answer is B.

8. Using the same theorem and use trial and error to determine which is not plausible.

a = 8      b = 25   

if c = 18                   if c = 21                if c = 27                    if c = 35

8 + 25 > 18 True     8 + 25 > 21 True   8 + 25 > 27  True    8 + 25 > 35 False
25 + 18 > 8 True     25 + 21 > 8 True   25 + 27 > 35 True  
8 + 18 > 25 True     8 + 21 > 25 True   8 + 27 > 25  True
18 is possible          21 is possible       27 is possible           35 is not possible

Your answer is then D.


As for questions 9 and 10, it cannot be answered without the figure given.

But just remember that complementary angles are two angles that have a sum of 90° . Supplementary angles are two angles that sum up to 180°. 
 









5 0
3 years ago
Read 2 more answers
Ivana has $350 in her savings account. She
Alenkinab [10]

Answer:

40%

Step-by-step explanation:

140/350=0.4

0.4 x 100=40

6 0
2 years ago
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