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natali 33 [55]
3 years ago
8

Help soon as possible

Mathematics
1 answer:
ratelena [41]3 years ago
4 0

Answer:

Step-by-step explanation:

1.  x^2 + 6x = 5

   x^2 + 6x + 9 = 14

   (x+3)^2 = 14

   x = \sqrt{14} - 3

2. x^2 + 8x -4 = 0

   x^2 + 8x = 4

   x^2 + 8x + 16 = 20

   (x+4)^2 = 20

   x = \sqrt{20} - 4

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Use the following information to answer problems 14-16: Suppose that in a large metropolitan area, 82% of all households have ca
Helen [10]

Answer:

66.6% or 0.66

Step-by-step explanation:

82% or 0.82 of All households have cable TV.

X = The number of households in a group of 6, that have cable TV.

You wish to find the proportion or percentage of groups for which EXACTLY 4 of 6 households will have cable TV.

82% of 6 is = 4.92

Approximately 4.92 out of 6 households, have cable TV.

Using this figure, you can now find out what % of 6 will give you 4.

Cross multiply:

0.82 - 4.92

M - 4

M = (4×0.82) ÷ 4.92 = 3.28÷4.92 = 0.666

Hence, 66.6% of 6 households, have cable TV. In other words, exactly 4 households (X=4) have cable TV.

To test, you can find what 66% of 6 is. You will get 4.

6 0
3 years ago
Please help me with this question
san4es73 [151]

Step-by-step explanation:

Given: f'(x) = x^2e^{2x^3} and f(0) = 0

We can solve for f(x) by writing

\displaystyle f(x) = \int f'(x)dx=\int x^2e^{2x^3}dx

Let u = 2x^3

\:\:\:\:du=6x^2dx

Then

\displaystyle f(x) = \int x^2e^{2x^3}dx = \dfrac{1}{6}\int e^u du

\displaystyle \:\:\:\:\:\:\:=\frac{1}{6}e^{2x^3} + k

We know that f(0) = 0 so we can find the value for k:

f(0) = \frac{1}{6}(1) + k \Rightarrow k = -\frac{1}{6}

Therefore,

\displaystyle f(x) = \frac{1}{6} \left(e^{2x^3} - 1 \right)

5 0
3 years ago
 Van purchased a DVD player on sale. The original selling price was ​$175.80. The sale price was ​$149.42. What is the first ste
rjkz [21]

Answer:

The percent decrease was 15%

Step-by-step explanation:

In order to find this, use the percent change equation.  

(New - Old)/(Old) * 100 = % Change

Now input 149.42 for the New price and 175.80 for the Old price.  

(149.42 - 175.80)/(175.80) * 100 = % Change

-26.38/175.80 * 100 = % Change

-.15 * 100 = % Change

-15 = % Change

5 0
4 years ago
Solve for x in the following figure and choose the appropriate result.
den301095 [7]

Answer:

2x is equal to 45

e is equal to x and 2

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Plz help me brainliest to whoever answers first.
nika2105 [10]

Answer:B) (8x5)xb

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
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