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likoan [24]
4 years ago
14

How do you factor 3u^3-4u^2-9u+12 ? Can someone please help?

Mathematics
1 answer:
Juliette [100K]4 years ago
5 0
3u³ - 4u² - 9u + 12
u²(3u) - u²(4) - 3(3u) + 3(4)
u²(3u - 4) - 3(3u - 4)
(u² - 3)(3u - 4)
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Alan drove 260 miles using 12 gallons of gas. At this rate, how many gallons of gas would he need to drive 286 miles?
jekas [21]

Answer:

Alan would need 13.2 gallons of gas to drive 286 miles.  

Step-by-step explanation:

This question can be solved in a number of ways.  First, you can find the unit rate, or the approximate amount of miles that Alan can drive per gallon of gas.  Since we know that Alan drove 260 miles using 12 gallons of gas, we can divide the number of miles by the number of gallons to get the amount of miles per gallon:  260 ÷12 = 21.67miles per gallon.  In order to find the amount of gas needed to drive 286, we take the total mileage divided by the unit rate:  286 ÷ 21.67 = 13.2 gallons.  The other way to solve is using a proportion with a variable, for example:  260/12 = 286/x.  Using cross-multiplication and divide, we get 260x = 3432, divide both sides of our equation by 260 to isolate the variable and solve for x = 13.2  Either method will result in the same answer.  

6 0
3 years ago
If the product of two numbers is positive, which of the following expressions must be true?
larisa86 [58]

Answer:

C. The factors had the same sign.

Step-by-step explanation:

Factors that had the same sign will have a positive product.

Two positive numbers will have a positive product.

For example, 3 times 3 is 9.

Two negative numbers will also have a positive product, because multiplying negative numbers by other negative numbers will cancel out the negative.

For example, -3 times -3 is 9.

So, C is correct

4 0
4 years ago
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The blood pressure of a group of adults is normally distributed with a mean of 122 and a standard deviation of 13. If Mina's blo
aev [14]

Answer:

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4 0
3 years ago
Callie has a new kitten. They can weigh 3 pounds less than half the weight of Callie‘s cat. Together the cat and kitten weigh 18
gavmur [86]

Answer:

The weight of cat is <u>14 pounds</u> and the weight of kitten is <u>4 pounds</u>.

Step-by-step explanation:

Given:

Callie has a new kitten. It can weigh 3 pounds less than half the weight of Callie‘s cat. Together the cat and kitten weigh 18 pounds.

Now, to find the weight of each animal:

Let the cat's weight be x.

And the kitten weight = \frac{x}{2} -3

Total weight of cat and kitten = 18 pounds.

Now, to set an equation to get the weight of each animal:

(x)+(\frac{x}{2}-3)=18

x+\frac{x}{2} -3=18

\frac{2x+x-6}{2} =18

\frac{3x-6}{2} =18

<em>Multiplying both sides by 2 we get:</em>

<em />3x-6=36<em />

<em>Adding both sides by 6 we get:</em>

<em />3x=42<em />

<em>Dividing both sides by 3 we get:</em>

<em />x=14\ pounds.<em />

<em>The weight of cat = 14 pounds.</em>

Substituting the value of x to get the kitten's weight:

\frac{x}{2} -3\\\\=\frac{14}{2}-3\\\\=7-3\\\\=4.

<em>The kitten's weight = 4 pounds.</em>

Therefore, the weight of cat is 14 pounds and the weight of kitten is 4 pounds.

7 0
3 years ago
How much is 1 1/4 + 3/4 + 1 1/3 step by step
dangina [55]

Answer:

  3 1/3

Step-by-step explanation:

<u>Step 1</u> is to look at the problem.

Here, you notice that the first two numbers have fractions that are quarters. The total of those two fractions is 1/4 + 3/4 = 4/4 = 1.

So, the sum of the first two numbers is ...

  1 1/4 + 3/4 = 1 +(1/4 +3/4) = 1 +1 = 2

<u>Step 2</u> is to add the next mixed number, which has a fraction with a different denominator. Since you have no fractions to add at this point, the sum is just ...

  2 + 1 1/3 = 3 1/3

_____

<em>Comment on adding fractions</em>

Generally, adding fractions requires you determine a common denominator. Often, you are asked to find the <em>least</em> common denominator, but that isn't necessary. Sometimes that can save the work of reducing the fraction that results, but sometimes it makes more work.

Here, a common denominator for fourths and thirds would be twelfths:

  1/4 = 3/12

  1/3 = 4/12

However, since adding the fourths results in an integer, no common denominator is necessary.

3 0
4 years ago
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