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3 years ago

Solve for X (Heres the picture of the problem) Pls help I’m so clueless

Mathematics

2 answers:

Elan Coil [88]3 years ago

4 0

Answer:

x=7

Step-by-step explanation:

4 *(4+x) = 2 * (2+20)

Distribute

16+4x =2*22

16+4x = 44

Subtract 16 from each side

16+4x-16 = 44-16

4x=28

Divide each side by 4

4x/4 =28/4

EleoNora [17]3 years ago

4 0

Answer:

x =7

Step-by-step explanation:

Secant-Secant Formula:

(whole secant) x (external part) = (whole secant) x (external part)

4 *(4+x) = 2 * (2+20)

Distribute

16+4x =2*22

16+4x = 44

Subtract 16 from each side

16+4x-16 = 44-16

4x=28

Divide each side by 4

4x/4 =28/4

x=7

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An adult can lose or gain two pounds of water in the course of a day. Assume that the changes in water weight are uniformly dist

Levart [38]

Answer:

Standard deviation of the weight over a day is 1.15

Step-by-step explanation:

Since it is given that water weight is uniformly distributed between -2 to 2.

So applying formula for variance of uniformly distribution as follows,

$variance=\dfrac{\left (b-a\right )^{2}}{12}$

From the given data, values of a and b is , $a=-2$ , $b=2$ ..

Substituting the values,

$variance=\dfrac{\left (2-\left (-2 \right )\right )^{2}}{12}$

Now, $-\left ( -2 \right )=2$

$variance=\dfrac{\left (2+2\right )^{2}}{12}$

$variance=\dfrac{\left (4\right )^{2}}{12}$

$variance=\dfrac{16}{12}$

Dividing the fraction by 4,

$variance=\dfrac{4}{3}$

So, the value of variance is $\dfrac{4}{3}$

The formula for standard deviation is given as,

$Standard\:deviation=\sqrt{variance}$

Substituting the value,

$Standard\:deviation=\sqrt{\dfrac{4}{3}}$

$Standard\:deviation=1.15470$

Rounding to 2 decimal places,

$Standard\:deviation=1.15$

So, the value of standard deviation is 1.15.

4 0

3 years ago

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How many times smaller will a number become if is it decreased by 20%?

stealth61 [152]

Answer:

Step-by-step explanation:

I'm unsure why my answer was deleted, randomly deleted a thoroughly explained answer.

20% is 20/100, 1/5, or 0.2

The number will decrease by a factor of 5.

3 0

3 years ago

a forest covers 58,000 acres. A survey finds that 0.2 of the forest is old-growth trees. how many acres of old-growth trees are

Lunna [17]

Answer:
116 acres

Explanation: 0.2% = .002

So 58,000 x .002 = 116

4 0

3 years ago

Can anybody help me out on this? Thanks.

Ksenya-84 [330]

Answer:

$x = 3$

Step-by-step explanation:

Given

$y = -2x^2 + 12x +7$

Required

The x coordinate of the vertex

Using the general form:

$y = ax^2 +bx +c$

The x coordinate is:

$x = -\frac{b}{2a}$

In $y = -2x^2 + 12x +7$

$a = -2$

$b = 12$

$c = 7$

So, we have:

$x = -\frac{b}{2a}$

$x = -\frac{12}{2*-2}$

$x = -\frac{12}{-4}$

$x = \frac{12}{4}$

$x = 3$

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3 years ago

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bixtya [17]

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3 years ago

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