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IRINA_888 [86]
4 years ago
14

Can someone please help me SIMPLIFY #30 and #31 ????

Mathematics
1 answer:
____ [38]4 years ago
6 0
Basically, you just have to distribute and then add. Let's do that:

30. 
x( \frac{3}{2}x-2)+6( \frac{5}{2}x- \frac{2}{3})
(\frac{3}{2}x^2-2x)+( \frac{15}{2}x -4)

Combine like terms (and this is your answer):
\frac{3}{2}x^2- \frac{11}{2}x - \frac{2}{3}

31. Same thing (except convert 1 and 1/5 to an improper fraction):
(\frac{6}{5})(x+ \frac{3}{2})- \frac{9}{10}
\frac{6}{5}x + \frac{9}{5} - \frac{9}{10}
\frac{6}{5}x +  \frac{9}{10}

Hope this helped!

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Find a and b if<br>2^a×3^b=12​
krok68 [10]

Answer:

12=12

Step-by-step explanation:

2a = b

a -3b =12

To solve, set one of the equations equal to zero.  The first equation is actually already set to 0.

b = 2a

Now you can plug this equation into the other one, by substituting the b in the equation with this.

a -3b = 12

a – 3(2a) = 12

Now all you have to do is distribute the 3 (multiply the number outside the parenthesis, 3 in this case, by everything inside).

a – 6a = 12

Combine like terms.  Since we have 1 positive a and 6 negative ones, we subtract the two numbers without the signs

6-1 = 5

And take the sign of the larger number.  Since 6 is large and 6 is negative, we are left with

-5a = 12

Now solve for a, which in this case means dividing both sides by -5

a = -12/5

Simplify

a = -2.4

Now that you have a, it’s easy to find b

b = 2a

b = 2(-2.4)

b= -4.8

Now you check your work by plugging your new a and b into either equation to see if it’s true.

-4.8 = 2(-2.4)

-4.8 = -4.8

And just for laughs let’s try the other equation

 

a -3b =12

-2.4 – 3(-4.8) = 12

Distribute the 3 again.  Remember that when two negative numbers are multiplied they become positive.

-2.4 +14.4 = 12

12 = 12

6 0
3 years ago
Find the area of the shape shown<br> below.
steposvetlana [31]

Answer:

The area of the figure is 28 units².

Step-by-step explanation:

Find the area of the full rectangle, ignoring the triangle.

a = lw \\ a = 4 \times 8 = 32

Then, find the area of the triangle:

a =  \frac{bh}{2}  \\ a =  \frac{2 \times 4}{2}  \\ a = 4

Finally, subtract:

32 - 4 = 28

7 0
3 years ago
The cross country team practices by jogging on
levacccp [35]
21 miles because 6x3+3
7 0
3 years ago
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Classify the system correctly <br> Y = 5x +2<br> 10x - 2y = 12
s344n2d4d5 [400]

Answer:

It's a simultaneous equation because it as two solution

Step-by-step explanation:

5 0
3 years ago
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If 43 of the 148 reams of paper purchased by a department are used, what is the percentage that remains?
Wewaii [24]
100%/x%=148/43
<span>(100/x)*x=(148/43)*x       - </span>we multiply both sides of the equation by x
<span>100=3.44186046512*x       - </span>we divide both sides of the equation by (3.44186046512) to get x
<span>100/3.44186046512=x </span>
<span>29.0540540541=x </span>
<span>x=29.0540540541

</span>now we have: 
<span>43 is 29.0540540541% of 148</span>
3 0
3 years ago
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