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3 years ago

Need help..thanks......

Mathematics

1 answer:

Vinvika [58]3 years ago

7 0

Answer: D) Flat area with a large number of plants

The roots of the plants hold in the soil, which prevents/reduces erosion.

The steeper slope means gravity pulls down the soil material faster, since there is less ground in the way to hold it up, so to speak. So flatter areas are less prone to erosion compared to steeper areas.

So that's why overall, flatter areas with lots of plants would have the least erosion.

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See ss below<br>please show all work

____ [38]

Answer:

x = 117km

Step-by-step explanation:

a1 = 18 km

q = 90% = 90/100 = 0.9

a2 = a1 • q = 18 • 0.9 = 81/5 = 16.2 km

a3 = a2 • q = 16.2 • 0.9 = 729/50 = 14.58 km

n = 10

x = a1 • q^n - 1/q - 1 = 18 • 0.9^10 - 1/0.9 - 1 = 117km

7 0

3 years ago

Read 2 more answers

What would x equal for this question

just olya [345]

Answer:

Which x are you talking about?

4 0

3 years ago

Find the sum 6y sqrt a +7y sqrt a

Rom4ik [11]

For this case we must add the terms of the following expression:

$6y \sqrt {a} + 7y \sqrt {a}$

It is noted that the terms are similar, so we can add:

We take common factor $\sqrt {a}:$

$\sqrt {a} (6y + 7y) =$

We add the terms within the parenthesis:

$\sqrt {a} (13y) =$

finally we have:

$13y \sqrt {a}$

Answer:

$13y \sqrt {a}$

7 0

3 years ago

Read 2 more answers

Use the graph to answer the questions in part 1-3.

Tems11 [23]

Answer:

Part 1: m = -7

Part 2: y = -7x -11

Part 3: 7x + y = -11

Step-by-step explanation:

Part 1

Select 2 points, in this case (-2, 3) and (-1, -4) and then use the slope formula

m = (y2 - y1) / (x2 - x1)

m = (-4 -3) / (-1 - -2) =

m = -7/1

m = -7

Part 2

Use the point-slope form equation to find the slope-intercept form

y - y1 = m(x - x1)

y - 3 = -7(x - -2)

y = -7(x +2) +3

y = -7x -14 +3

y = -7x -11

Part 3

Move the x and y to the same side of the equation

y = -7x -11

7x + y = -11

8 0

4 years ago

Help me please, match the number to the letter

kenny6666 [7]

Answer: 1b 2c 3e? 4d 5a

<u>Step-by-step explanation:</u>

There are 2 items that need to be checked.

The midpoint of the coordinates is the center of the circle
The diameter of the coordinates is the diameter of the circle.

Midpoint:

$Midpoint = \bigg(\dfrac{x_1+x_2}{2},\dfrac{y_1+y_2}{2}\bigg)\\\\\\1)\ \bigg(\dfrac{-4+2}{2},\dfrac{-1+10}{2}\bigg)=\bigg(\dfrac{-2}{2},\dfrac{9}{2}\bigg)=(-1, 4.5)\implies \text{equation b}\\\\\\2)\ \bigg(\dfrac{1+7}{2},\dfrac{3-10}{2}\bigg)=\bigg(\dfrac{8}{2},\dfrac{-7}{2}\bigg)=(4, -3.5)\implies \text{equation c}\\\\\\3)\ \bigg(\dfrac{4-8}{2},\dfrac{-2+6}{2}\bigg)=\bigg(\dfrac{-4}{2},\dfrac{4}{2}\bigg)=(-2,2 )\implies \text{none of the equations}$

$4)\ \bigg(\dfrac{6-4}{2},\dfrac{3-13}{2}\bigg)=\bigg(\dfrac{2}{2},\dfrac{-10}{2}\bigg)=(1, -5)\implies \text{equation d}\\\\\\5)\ \bigg(\dfrac{7-1}{2},\dfrac{5+8}{2}\bigg)=\bigg(\dfrac{6}{2},\dfrac{13}{2}\bigg)=(3, 6.5)\implies \text{equation a}$

Diameter:

distance between coordinates = 2√r² (from circle equation)

$\text{formula for coordinates is: }d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}\\\\1)\ \text{Coordinates: } d=\sqrt{(-4-2)^2+(-1-10)^2}=\sqrt{36+121}=12.5\\b)\ \text{Circle: }2\sqrt{39.25}=12.5\\\\\\2)\ \text{Coordinates: } d=\sqrt{(1-7)^2+(3+10)^2}=\sqrt{36+169}=14.3\\c)\ \text{Circle: }2\sqrt{51.25}=14.3\\\\\\4)\ \text{Coordinates: } d=\sqrt{(6+4)^2+(3+13)^2}=\sqrt{100+256}=18.9\\d)\ \text{Circle: }2\sqrt{89}=18.9$

$5)\ \text{Coordinates: } d=\sqrt{(7+1)^2+(5-8)^2}=\sqrt{64+9}=8.5\\a)\ \text{Circle: }2\sqrt{18.25}=8.5$

Check:

Graph to confirm your answers are correct (see attached)

8 0

4 years ago