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3 years ago

Solve: 2x2-x = 21 {-7/2,3} {-3, 7/2}

Mathematics

1 answer:

Sergio039 [100]3 years ago

4 0

Answer:

The answer is (-3,7/2)

Step-by-step explanation:

$2 {x}^{2} - x - 21 = 0 \\ (2x - 7)(x + 3) = 0 \\ 2x - 7 = 0 \: \: \: or \: \: x + 3 = 0 \\ x = \frac{7}{2} \: \: and \: x = - 3$

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Answer:

Step-by-step explanation:

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2 years ago

Hacer una representación gráfica para nuestro caso tenemos por un punto M pasan infinitas rectas?

vladimir1956 [14]

Answer:

make a graphical representation for our case do we have infinite lines pass through a point M?

Step-by-step explanation:

If the graphs of the equations do not intersect (for example, if they are parallel), then there are no solutions that are true for both equations. If the graphs of the equations are the same, then there are an infinite number of solutions that are true for both equations.

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2 years ago

Order these ratios from least to greatest- 7:2, 12 to 4, 20/6, 21:14, 10:5 pls :,)

Brrunno [24]

Answer:

21:14, 10:5, 12 to 4, 20/6, and 7:2

Step-by-step explanation:

first simplify all the ratios.

the first one is already simplified

12 to 4 = 3 to 1

20/6 = 10/3

21:14 = 3:2

10:5 = 2:1

Next find the least common factor the the three digits, 1, 2, and 3 and which is 6.

Multiply the simplified factors into the least common factor. So 7:2 will be multiplied by 6 so it will be 21:6

Do it with the rest of the factors and get

21:6, 18 to 6, 20/6, 9:6, and 12:6

Finally order them from least to greatest,

9:6, 12:6, 18 to 6, 20/6, and 21:6

21:14, 10:5, 12 to 4, 20/6, and 7:2

4 0

3 years ago

6. For a particular pickup truck, the percent markup is known to be 115% based on cost to the seller. If the seller paid $15,800

Neko [114]

Answer:

53.5 %

Explanation:

You can convert the percent markup into a multiplicative factor in this way:

Base price: 15,800 . . . (cost to the seller)

Percent mark up: 115% . . . (based on the cost to the seller)

Sale price: 15,800 + 115% of x = 15,800 + 115 × 15,800 /100 =

= 15,800 + 1.15 × 15,800 = 15,800 (2.15) = 33,970

The markup is:

Markup = price paid by the seller - cost to the seller = 33,970 - 15,800 = 18,170 (notice that this is 115% of 15,800)

And the percent markup based on the sale price is:

% = (markup / sale price) × 100 = (18,700 / 33,970) × 100 =

= 53.49 %

Rounding to the nearest tenth percent that is 53.5 %.

4 0

3 years ago

A water well rig has dug to a height of -60 feet after one full day of continuous use. if the rig has been running and is curren

Romashka [77]

Given :

A water well rig has dug to a height , H = 60 feet after one full day of continuous use .

To Find :

If the height is currently 143.6 feet how time it been running .

Solution :

It is given that height after 24 hours of use is 60 feet .

So , height loose in 1 hours is :

$h=\dfrac{60}{24}\ feet\\\\h=2.5 \ feet$

Now , time taken to cover a height of 143.6 feet is :

$t = \dfrac{143.6}{2.5}\ hours\\\\t=57.44\ hours$

Therefore , time taken is 57.44 hours .

Hence , this is the required solution .

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3 years ago

Solve: 2x2-x = 21 {-7/2,3} {-3, 7/2}​

Solve: 2x2-x = 21 {-7/2,3} {-3, 7/2}