3 years ago

Estimate the sum by rounding each number to the nearest hundred first

Mathematics

1 answer:

Natasha2012 [34]3 years ago

4 0

500+600+900+400+600= 3000

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Angle Sum Theorem. y = ?

salantis [7]

Answer:

90°

Step-by-step explanation:

Interior angles of ALL triangles sum to 180°

The whole large triangle has angles 60 60 60 ( they sum to 180)

that means x = 30

then the small triangle on the right has 60 + 30 + y = 180

meaning y = 90 °

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A percent is a way of a expressing a part out of 100. Remember learning about ratios and how they compare quantities? A part-to-

neonofarm [45]

Answer:A

Step-by-step explanation:

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3 years ago

Elimination method<br> 4x-2y=48<br> 2x+6y=-18

yulyashka [42]

$4x-2y=48\\ \\ 2x+6y=-18$

First we'll multiply the second equation by -2

$-2\cdot (2x+6y)=-2\cdot -18\\ \\ -4x-12y=36$

Now let's add the new equation and the first one.

$(4x-2y)+(-4x-12y)=48+36\\ \\ 4x-4x-2y-12y=48+36\\ \\ -14y=84\\ \\ y=\frac { 84 }{ -14 } \\ \\ y=-6$

We found y's value. We'll plug it in one of the equations to find x's value.

$y=-6\\ \\ 4x-2y=48\\ \\ 4x-2\cdot -6=48\\ \\ 4x+12=48\\ \\ 4x=48-12\\ \\ 4x=36\\ \\ x=\frac { 36 }{ 4 } \\ \\ x=9$

Solution ;

(9, -6)

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3 years ago

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I need help in khan academy ASAP!!

Anika [276]

The answer for the question is y = 3x + 5

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3 years ago

What is the Slope of the line

vampirchik [111]

Answer:

$m=\frac{-3}{4}$