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miss Akunina [59]

3 years ago

5

Please help...20 points! And explain

1 answer:

son4ous [18]3 years ago

6 0

Perpendicular = opposite sign and reciprocal
The slope of perpendicular line would be -2
Equation y= -2x

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Write an equation in point-slope form, y – y1 = m(x – x1), of the line through points (9, –2) and (10, 2). Use (9, –2) as the po

True [87]

$\bf \begin{array}{ccccccccc}
&&x_1&&y_1&&x_2&&y_2\\
% (a,b)
&&(~ 9 &,& -2~) 
% (c,d)
&&(~ 10 &,& 2~)
\end{array}
\\\\\\
% slope = m
slope = m\implies 
\cfrac{\stackrel{rise}{ y_2- y_1}}{\stackrel{run}{ x_2- x_1}}\implies \cfrac{2-(-2)}{10-9}\implies \cfrac{2+2}{10-9}\implies \cfrac{4}{1}\implies 4
\\\\\\
% point-slope intercept
\stackrel{\textit{point-slope form}}{y- y_1= m(x- x_1)}\implies y-(-2)=4(x-9)\implies y+2=4(x-9)$

4 0

3 years ago

Estimate the sum : 7.2 + 7.3 + 6.9 + 6.8.

kkurt [141]

Answer:

28.2

Step-by-step explanation:

7.2 + 7.3 + 6.9 + 6.8 = 28.2

8 0

3 years ago

Read 2 more answers

He cost, in millions of dollars, of building a three-story high school in new york state was estimated to be c(x) = 2.1 + 0.12x

ratelena [41]

Given cost function is

c(x) = $2.1 + 0.12x - 0.0001x^2$ (20 ≤ x ≤ 400)

where x is the number of thousands of square feet

total revenue will be $0.2 million dollars per thousand square feet

Revenue is 0.2 millions per thousand square feet. we know x is the number of thousand of square feet

So R(x) = 0.2x

We know Profit = Revenue - Cost

P(x) = R(x) - C(x)

$P(x) = 0.2x - (2.1 + 0.12x - 0.0001x^2)$

$P(x) = 0.2x - 2.1 - 0.12x + 0.0001x^2)$

combine like terms

$P(x) =-2.1 + 0.08x + 0.0001x^2$

Profit function is

$P(x) =0.0001x^2 + 0.08x - 2.1$

5 0

3 years ago

nikita wrote the expression 72 + 26. Bettina wrote the expression 4(72+26). Which sentence is true about the value of their expr

katen-ka-za [31]

Nikita's value is 4 times less than Bettina's value. I believe this is the answer.

8 0

3 years ago

In 1924, the tempature in Fairfield, Montana, dropped from 63 degrees to 21 in 12 hour. What was the average hourly change in te

Drupady [299]

Find the change
the change is 63-21=42
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we want to find xdegrees/1hour
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8 0

3 years ago