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3 years ago

How do I use the method of elimination?

Mathematics

2 answers:

Klio2033 [76]3 years ago

8 0

Basically what you do is for the equations you want to get y on one side and then you solve it like a substitution problem.

3241004551 [841]3 years ago

4 0

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The expression (2x^2+6x+5)-(6x^2+3x+5) is equivalent to

oksano4ka [1.4K]

Answer:

-4x^2+3x

Step-by-step explanation:

collect like terms

(2x^2-6x^2) + (6x-3x) + (5-5)

simplify

-4x^2 + 3x

7 0

4 years ago

The height of a small rock falling from the top of a 124-ft-tall building with an initial downward velocity of –30 ft/sec is mod

Contact [7]

Answer:

Option 3.

Step-by-step explanation:

The given function is

$h(t)=-16t^2-30t+124$

where, h(t) is the height of a small rock falling from the top of a 124-ft-tall building and t is the time in seconds.

It is a downward parabola.

Equate the function equal to 0, to find the time at which the rock touch the ground.

$-16t^2-30t+124=0$

If $ax^2+bx+c=0$ , the according to the quadratic formula

$x=\dfrac{-b\pm \sqrt{b^2-4ac}}{2a}$

Using quadratic formula, we get

$t=\dfrac{-(-30)\pm \sqrt{(-30)^2-4(124)(-16)}}{2(-16)}$

$t=\dfrac{30+\sqrt{(-30)^2-4(124)(-16)}}{2(-16)},\dfrac{30-\sqrt{(-30)^2-4(124)(-16)}}{2(-16)}$

$t=-3.875, 2$

Time cannot be negative. So, the rock remain in the air in the interval 0 < t < 2.

Therefore, the correct option is 3.

6 0

3 years ago

A tin box has a mass of 280 grams and a volume of 40 cubic centimeters. What is its density?

olchik [2.2K]

Answer:

Step-by-step explanation:

Density = mass/volume

Mass = 280g, volume = 40cm^3

Density = 280/40

Density = 7g/cubic cm

6 0

3 years ago

92%

igomit [66]

Answer:

always

Step-by-step explanation:

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4 years ago

Carrie is seven years older than Dan in four years the sum of their ages will be 63 find the age of each man now

Ksenya-84 [330]

never mind my answers wrong

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3 years ago