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olga55 [171]
4 years ago
8

Factorise fully 3x - 9x 4x² + 28x

Mathematics
2 answers:
Elenna [48]4 years ago
3 0

Answer 3x(1-3)

3x(-2)

-6x

4x(x+7)

Step-by-step explanation:

bazaltina [42]4 years ago
3 0
Answer: 3x(3-1)

Explaination:
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on Thursday 263 people went to the concert, on Friday 118 people went to the concert. how many more people went to the concert o
Harlamova29_29 [7]
145 more people attended the concert on Thursday
7 0
3 years ago
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15. Which of the following inequalities is NOT equivalent to the one shown here? 5 – 5k > -45
Nesterboy [21]
The answer to your question is A
5 0
3 years ago
What is j equal to in 1 2/3j=15
Vladimir [108]

Answer:90

Step-by-step explanation:One solution was found :

                  j = 90

Rearrange:

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :

                    1/2/3*j-(15)=0  

Step by step solution :

Step  1  :

           1

Simplify   —

           2

Equation at the end of step  1  :

  1              

 (— ÷ 3 • j) -  15  = 0  

  2              

Step  2  :

        1      

Divide  —  by  3

        2      

Equation at the end of step  2  :

  1          

 (— • j) -  15  = 0  

  6          

Step  3  :

Rewriting the whole as an Equivalent Fraction :

3.1   Subtracting a whole from a fraction

Rewrite the whole as a fraction using  6  as the denominator :

         15     15 • 6

   15 =  ——  =  ——————

         1        6    

Equivalent fraction : The fraction thus generated looks different but has the same value as the whole

Common denominator : The equivalent fraction and the other fraction involved in the calculation share the same denominator

Adding fractions that have a common denominator :

3.2       Adding up the two equivalent fractions

Add the two equivalent fractions which now have a common denominator

Combine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible:

j - (15 • 6)     j - 90

————————————  =  ——————

     6             6    

Equation at the end of step  3  :

 j - 90

 ——————  = 0  

   6    

Step  4  :

When a fraction equals zero :

4.1    When a fraction equals zero ...

Where a fraction equals zero, its numerator, the part which is above the fraction line, must equal zero.

Now,to get rid of the denominator, Tiger multiplys both sides of the equation by the denominator.

Here's how:

 j-90

 ———— • 6 = 0 • 6

  6  

Now, on the left hand side, the  6  cancels out the denominator, while, on the right hand side, zero times anything is still zero.

The equation now takes the shape :

  j-90  = 0

Solving a Single Variable Equation :

4.2      Solve  :    j-90 = 0  

Add  90  to both sides of the equation :  

                     j = 90

One solution was found :

                  j = 90

8 0
4 years ago
Read 2 more answers
Kaapo is mixing Kona beans and Maui beans to make 25 pounds of coffee blend. Kona beans cost Kaapo $15 per pound and Maui beans
son4ous [18]

Answer:

<u>Kaapo will use 17.5 pounds of Kona beans and 7.5 pounds of Maui beans for his blend to cost him $ 17.70 per pound.</u>

Step-by-step explanation:

1. Let's review the information given to us to answer the problem correctly:

Number of pounds of the coffee blend = 25

Cost of Kona beans = US$ 15 per pound

Cost of Maui beans = US$ 24 per pound

Cost of the coffee blend = US$ 17.70 per pound

2. How many pounds of each coffee bean should Kaapo use for his blend to cost him $17.70 per pound?

Let's build our equation to answer the question, this way:

x = Number of pounds of Kona beans for Kaapo's blend

25 - x = Number of pounds of Maui beans for Kaapo's blend

Number of pounds of Kona beans for Kaapo's blend * Cost of Kona beans +  Number of pounds of Maui beans for Kaapo's blend * Cost of Maui beans = Number of pounds of the coffee blend * Cost of the coffee blend

Replacing with the real values, we have:

15x + 24 (25-x) = 17.70 * 25

15x + 600 - 24x = 442.50

-9x = 442.50 - 600

-9x = -157.50

x = -157.50/-9

x = 17.50 ⇒ 25 - x = 7.50

<u>Kaapo will use 17.5 pounds of Kona beans and 7.5 pounds of Maui beans for his blend to cost him $ 17.70 per pound.</u>

8 0
3 years ago
Irfan exited his apartment building and walked 20 blocks west. He then walked an additional 5 blocks west.
SVETLANKA909090 [29]
Think of it as a triangle. 20 is the height, 5 is the side. Use the Pythagorean Theorem to find the diagonal distance. 20 squared, or 400, plus 5 squared, or 25, is 425. Now square root that. It's around 20.6. However, they might just ne asking an addition question, since you can't go through solid blocks...
5 0
3 years ago
Read 2 more answers
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