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3 years ago

Which expression represents 4 less than twice a number, n?

Mathematics

2 answers:

andrew-mc [135]3 years ago

3 0

Answer:

x = 2n - 4

Step-by-step explanation:

hope this helped have a great day

AnnZ [28]3 years ago

3 0

The answer is y=x^2-4

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Find the remainder when f(x)=−2x3+x2−4x+1 is divided by x+3.

andre [41]

Answer:

4 the answer is 4

Step by step explanatin:

8 0

2 years ago

A study of the relationship between age and various visual functions (such as acuity and depth perception) reported the followin

maks197457 [2]

Answer:

(a) $\sum x_i=56.68$ and $\sum x_i^2=197.46$

(b) The sample variance is $s^2=0.530$ and the sample standard deviation is $s=0.728$

Step-by-step explanation:

(a)

The sum of these 17 sample observations is

$\sum x_i=2.79\:+2.57+\:2.73\:+3.75\:+2.27+\:2.75+\:4.00+\:4.22+\:3.88+\:4.35+\:3.41+\:4.57+\:2.38+\:3.73\:+2.75+\:3.47+\:3.06\\\\\sum x_i=56.68$

and the sum of their squares is

$\sum x_i^2=2.79^2\:+2.57^2+\:2.73^2\:+3.75^2\:+2.27^2+\:2.75^2+\:4.00^2+\:4.22^2+\:3.88^2+\:4.35^2+\:3.41^2+\:4.57^2+\:2.38^2+\:3.73^2\:+2.75^2+\:3.47^2+\:3.06^2\\\\\sum x_i^2=197.46$

(b)

The sample variance, denoted by $s^2$ , is given by

$s^2=\frac{S_{xx}}{n-1}$

where $S_{xx} =\sum x_i^2-\frac{(\sum x_i)^2}{n}$

Applying the above formula we get that

$S_{xx}=197.46-\frac{(56.68)^2}{17}\\\\S_{xx} =8.482$

$s^2=\frac{8.482}{17-1}=0.530$

The sample standard deviation, denoted by <em>s</em>, is the (positive) square root of the variance:

$s=\sqrt{s^2}$

Applying the above formula we get that

$s=\sqrt{0.530}=0.728$

3 0

2 years ago

Write in point-slope form an equation of the line that passes through the

QveST [7]

Answer:

$y+6 = - 5(x-4)$

Step-by-step explanation:

With the given information, use the point-slope formula $y-y_1 = m (x-x_1)$ to write the equation of the line. Substitute values for the $m$ , $x_1$ , and $y_1$ to find the answer.

$m$ represents the slope, so substitute -5 in its place. The $x_1$ and $y_1$ represent the x and y values of one point the line intersects, so substitute 4 for $x_1$ and -6 for $y_1$ . This gives the following equation:

$y+6 = - 5(x-4)$

3 0

2 years ago

Please help me with this problem

sineoko [7]

Answer:

$4$