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Wewaii [24]
3 years ago
13

Can you solve (4x-3)/(x+2)+(15)/(x-3)

Mathematics
2 answers:
Murljashka [212]3 years ago
8 0
Please see the pic, I'd solved in it.

Andrews [41]3 years ago
3 0
\frac{4x-3}{x+2} + \frac{15}{x-3} = 0
1st step: We need to have a common denominator.
So we do this:
\frac{(4x-3)*(x-3)}{(x+2)*(x-3)} + \frac{(15)*(x+2)}{(x-3)*(x+2)} = 0
2nd step: Distribute them
\frac{4x^{2}-3x-12x+9}{(x-3)(x+2)} + \frac{15x+30}{(x+2)(x-3)} = 0
3rd step: Do the rest of the equation!
We can put it on one fraction, its fine.
\frac{4x^2-15x+9+15x+30}{(x+2)(x-3)} = 0
\frac{4x^2+39}{(x+2)(x-3)} = 0 (-15 and 15 cancels out)
4th step: take the denominator to the other side
4x²+39 = 0 (anything × 0 = 0)
5th step: Take 39 to the other side
4x² = -39
6th step: Divide by 4 on both sides
\frac{4x^2}{4} = -\frac{39}{4}
(4 and 4 cancels out)
x² = -\frac{39}{4}
7th step: Take the square root to keep x alone
x = -\sqrt\frac{39}{4}
It can also be written as:
x = -\frac{ \sqrt{39} }{ \sqrt{4} }
Final answer:
x = -\frac{ \sqrt{39} }{2}
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The radioactive isotope radium has a half-life of 1,600 years. The mass of a 100-gram sample of radium will be______ grams after
Olenka [21]
To solve this we are going to use the half life equation N(t)=N_{0} e^{( \frac{-0.693t}{t _{1/2} }) }
Where:
N_{0} is the initial sample
t is the time in years
t_{1/2} is the half life of the substance
N(t) is the remainder quantity after t years 

From the problem we know that:
N_{0} =100
t=200
t_{1/2} =1600

Lets replace those values in our equation to find N(t):
N(200) =100e^{( \frac{(-0.693)(200)}{1600}) }
N(200)=100e^{( \frac{-138.6}{1600} )}
N(200)=100e^{-0.086625}
N(200)=91.7

We can conclude that after 1600 years of radioactive decay, the mass of the 100-gram sample will be 91.7 grams.

8 0
3 years ago
Sally had 7 stars and eric had 186 stars .he gave 27 to sally how many does he have left?
Ilya [14]
To solve this you can use subtraction
186-27=159 (for the amount Eric gave away)
So Eric has 159 stars left!
Hope this helped!!
3 0
3 years ago
Read 2 more answers
I need to know question 8 I’m confused
marissa [1.9K]

Remark

Let the pigs = p

Let the chickens = c

Givens

30 heads is another way of saying that there were 30 creatures in the barnyard. In addition each chicken has 2 legs and each pig has 4

c + p = 30

2C + 4P = 100       (2) Divide (2) by 2

C + 2P = 50           (3)  Subtract (1) from (3)

<u>C + P    = 30</u>

       P  = 20

So there were 20 pigs.

3 0
3 years ago
How do you write 1 hundred 25tens 1one ??
My name is Ann [436]
I think it would be 1251 
7 0
3 years ago
Read 2 more answers
Please Help!
RUDIKE [14]

Answer:

1. this is the definition of a midpoint - bc the definition of a midpoint is: “If a point is a midpoint of a segment, then it divides that segment into two congruent parts” or “If a point divides a segment into two congruent parts, then it's the midpoint of that segment.”

2. this is the division property of equality -"The division property of equality states that when we divide both sides of an equation by the same non-zero number, the two sides remain equal". so, in this situation we want to isolate x which means dividing both sides by 20. This will keep both sides equal just more simplified  ( before, it was 20 and 100, after dividing both sides by 20 it is 1 and 5 which is the same ratio therefore they are still equal)

3. this one's the subtraction property of equality- this property means you can subtract the same number from both sides of an equation and get an equivalent equation. in this situation, they subtracted 15 from both sides to get AB = 30 and it ends being still being equal to AB + 15= 45.

4. this is the symmetric property of equality -  "This property states that if a = b, then b = a. That is, we can interchange the sides of an equation, and the equation is still a true statement." "it states that values are still equal no matter which side of the equal sign they're on." That's why its possible for XY=ST and ST=XY

5. this is definition of congruence - which basically states that if a value of one thing is equal to the value of another thing those two things can be called congruent.

6. this is substitution property- this is the property that allows you to substitute one value for another in an equation. the property states  that if  

x = y, then x can be substituted in for y in any equation, and y can be substituted for x in any equation, just like what they show here with 5AB substituting for CD in the equation.

i hope this helped!   im not that good at explaining so if u have more questions lmk!          

3 0
3 years ago
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