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3 years ago

Factor completely 4x3 + 28x2 + 7x + 49.

2 answers:

7 0

Try grouping in paires

4x^3 + 28x^2 + 7x + 49

= 4x^2(x + 7) + 7(x + 7) - note that (x + 7) is common to the 2 parts, so

= (4x^2 + 7)(x + 7)

Rasek [7]3 years ago

6 0

(x+7) (4x²+7) is the correct answer

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If you know any of these could yoy hep me out :D

Mekhanik [1.2K]

7. X=5
8. X=6
9. B=-3
10. G=3.4

5 0

2 years ago

The following are the number of birth per year per 1,000 population for 20 countries: 34, 24, 10, 15, 22, 15, 17, 22, 10, 17, 25

Anna35 [415]

Answer:

A. D = None of the above

B. B = 18

C. A = 15

D. D = None of the above

Step-by-step explanation:

Rearranging the population from the highest to the lowest.

10, 10, 12, 15, 15, 15, 15, 17, 17, 18, 18, 20, 22, 22, 24, 25, 31, 32, 34, 37

Mean = (summation of all the 20 samples)/ no of samples

Mean per year per 1000 population = 409/20

= 20.45

Median = the middle value (for odd numbered samples)

= the sum of the middle value ÷ 2 ( for even numbered samples)

Median birth per year per 1000 population = (18 + 18)/2

= 18

Mode = the sample that has the number of frequency

Mode per year per 1000 population = 15 (frequency = 4)

Range = highest value sample - lowest value sample

Range per year per 1000 population = 37 - 10

= 27

6 0

3 years ago

Y = 2x x + y = −6 the answer should be like this (x,y) or ( , )

melisa1 [442]

Answer:

(-2, -4)

Step-by-step explanation:

Given:

The system of equations to solve is given as:

$y=2x\\\\x+y=-6$

In order to solve this system of linear equations, we use substitution method.

In substitution method, we substitute the value of any one variable in the other equation.

So, we substitute the value of 'y' from first equation in the second equation.

This gives,

$x+2x=-6\\\\3x=-6$

Dividing both sides by 3, we get:

$\frac{3x}{3}=\frac{-6}{3}\\\\x=-2$

Now, $y=2x=2\times -2=-4$

Therefore, the solution is (-2, -4)

6 0

3 years ago

Arjun's piggy bank contains two kinds of coins and two kinds of bills. there are twice as many $1 bills like $5 bills. the numbe

olga55 [171]

Answer:

$5 bills x 5, $1 bills x 10, quarters x 16, dimes x 9

Step-by-step explanation:

$5 bills = x, total = 5x
$1 bills = 2x, total = x
Quarters = 3x + 1, total = 0.25(3x + 1)
Dimes = 3x + 1 - 7= 3x - 6, total = 0.1(3x - 6)

Equation below as the sum, solve for x:

5x + 2x + 0.25(3x + 1) + 0.1(3x - 6) = 39.9
7x + 0.75x + 0.25 + 0.3x - 0.6 = 39.9
8.05x - 0.35 = 39.9
8.05x = 40.25
x = 40.25/8.05
x = 5

Number of each bill and coin:

$5 bills = 5
$1 bills = 2*5 = 10
Quarters = 3*5 + 1 = 16
Dimes = 3*5 - 6 = 9

8 0

3 years ago

Read 2 more answers

X+ y + x + y + 3(y + 5)?

Anastasy [175]

Answer:

2x + 5y +15

Step-by-step explanation:

x + x + y + y + 3y + 15

2x + 2y +3y +15

2x +5y + 15

7 0

3 years ago