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2 years ago

PLEASE HELP AND FAST

Mathematics

1 answer:

aksik [14]2 years ago

7 0

Answer:

I think it's A because.

Step-by-step explanation:

A trendline is a line drawn over pivot highs or under pivot lows to show the prevailing direction of price. Trendlines are a visual representation of support and resistance in any time frame. They show direction and speed of price, and also describe patterns during periods of price contraction.

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A sample in which every person object or event has a equal chance of being selected

NemiM [27]

Answer:

Random Sample

Step-by-step explanation:

5 0

3 years ago

Need help asap......

Korvikt [17]

Answer:

Step-by-step explanation:

$(2x+20)+3x=180\\5x+20=180\\5x=180-20=160\\x=160/5=32$

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2 years ago

Write the equation of the circle below to complete the square. Also determine the area of the circle.

diamong [38]

Answer: $(x-7)^2+(y+2)^2=11^2$ ; $A=121\pi$

Step-by-step explanation:

I have never done a problem like this, so this is my first time attempting it.

The standard form for the equation of a circle is:

$(x-a)^2+(y-b)^2=r^2$

Begin by grouping the 'x' terms and 'y' terms:

$(x^2-14x)+(y^2+4y-68)=0$

Complete the square for the second polynomial:

$(\frac{b}{2} )^2=(\frac{4}{2} )^2=4$

$(x^2-14x)+(y^2+4y+4-4-68)=0$

$(x^2-14x)+(y^2+4y+4)-4-68=0$

$(x^2-14x)+(y^2+4y+4)-72=0$

$(x^2-14x)+(y+2)^2-72=0$

Do the exact same process with the other polynomial:

$(x^2-14x-72)+(y+2)^2=0$

Complete the square:

$(\frac{14}{2} )^2=49$

$(x^2-14x+49-49-72)+(y+2)^2=0$

$(x^2-14x+49)-49-72+(y+2)^2=0$

$(x^2-14x+49)-121+(y+2)^2=0$

$(x-7)^2-121+(y+2)^2=0$

Bring the 121 to the other side to get:

$(x-7)^2+(y+2)^2=121$

$(x-7)^2+(y+2)^2=11^2$

The above expression is the equation of our circle in standard form. It is centered at the coordinates (7, -2) and has a radius of 11 units. The area of a circle if given by:

$A=\pi r^2=121\pi$

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2 years ago

A bag contains 8 green marbles, 5 white marbles, and 2 red marbles.

hodyreva [135]

•in fraction form the answer is 2/15
•in percentage form the answer is 13.33333333...%

the way to figure this out is to add all the numbers up and divide it by the number of red marbles :)

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3 years ago

A certain ore is 31.8% nickel by mass. How many kilograms of this ore would you need to dig up to have 25.0 g of nickel?

natulia [17]

It will need 1.8 kilograms to have 25.0 g of nickel

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3 years ago