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Ierofanga [76]
2 years ago
12

Please help me with this question!!!!!​

Mathematics
1 answer:
Naddika [18.5K]2 years ago
6 0

Answer:

Equation of line in slope-intercept form that passes through (4, -8) and is perpendicular to the graph y= \frac {2}{5} x - 3 is below

y = - \frac {5}{2} x + 2

Step-by-step explanation:

Slope of the equation  y= \frac{2}{5} x -3   is  m_1 = \frac{2}{5}

Since slopes of perpendicular lines are negative reciprocal of each other, therefore slope of other line is given as

m_2 = - \frac {1}{m_1}  = - \frac {5}{2}

Equation of line in point slope form is given as

y-y_1=m_2(x-x_1)

Here  (x1, y1) = (4, -8)

y+8 = - \frac{5}{2} (x-4)

Simplifying it further  

y = - \frac {5}{2} x + \frac {5}{2} 4 - 8

y = - \frac {5}{2} x + 2

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Evaluate 15/r-1 when r=5
DochEvi [55]

Answer: 15/5=3 3-1= 2

The answer would be 2. :P



6 0
3 years ago
Read 2 more answers
Someone help me pleaseee
krok68 [10]

Answer:

  522

Step-by-step explanation:

The assumption is that the proportion of tagged fish caught is the same as the proportion of all fish that were caught and tagged:

  (all fish)/(number tagged) = (sample size)/(number in sample tagged)

  all fish = (number tagged) · (sample size)/(number in sample tagged)

  all fish = 174 · 39/13

  all fish = 522

If all the assumptions are reasonable, the number of fish in the lake is estimated at 522.

5 0
3 years ago
Factor completely 81x8 − 1. (9x4 − 1)(9x4 + 1) (3x2 − 1)(3x2 + 1)(9x4 − 1) (3x2 − 1)(3x2 + 1)(9x4 + 1) (3x2 − 1)(3x2 + 1)(3x2 +
denis-greek [22]

Answer:

(3x^2 - 1)(3x^2 + 1)(9x^4 + 1).

Step-by-step explanation:

Using the identity for the difference of 2 squares;

a^2 - b^2 = (a - b)(a + b)  

we put a^2 = 81x^8 and b^2 = 1  giving

a = 9x^4 and b = 1, so:

81x^8 − 1 =   (9x^4 - 1)(9x^4 + 1)

Applying the difference of 2 squares to 9x^4 - 1:

= (3x^2 - 1)(3x^2 + 1)(9x^4 + 1).

6 0
3 years ago
How to find the minimum value of an expression
miv72 [106K]
f(x)=9x²+24x+1
f(x)=(3x)²+ 2×3x× 4 + 1
= (3x)²+2×3x×4 +16 -16 +1
=. ( 3x+4)² -15. -------(1)
then (3x+4)² ≥0
least value of (3x+4)² is 0
putting in equation 1
= 0-15 =-15
- 15 is the least value
3 0
3 years ago
The city council of a large city needs to know whether its residents will support the building of three new schools. The council
Marrrta [24]

Answer: C) Survey a random sample of persons within each neighborhood of the city.

==============================================================

Explanation:

I'll go through each answer choice to say why it is either the answer or not the answer.

A. This is not the answer because teachers are over-represented while non-teachers are under-represented. The teachers will most likely respond favorably to the survey, skewing the results. The other townspeople's opinions would be left out.

B. This is not the answer because people living far away from the city in question should not have sway over what happens in the particular city. It makes no sense to have someone in San Francisco determine what happens in LA schools. It's better to ask people who live in the city. Perhaps you could extend the net to nearby surrounding cities assuming those parents commute into the city to drop off their kids at those schools.

C. This is the answer. It's best to ask city residents because it is a local city issue. I would put every resident's name or address into a computer database, then have a random number generator select those individuals.

D. This is not the answer. People who do not visit city hall will not be represented at all, which skews the results of what the people of the city want overall.

8 0
3 years ago
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