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Ahat [919]
3 years ago
15

2x ( 4x - 5) (22 – 81) = 0

Mathematics
1 answer:
shepuryov [24]3 years ago
6 0

Answer:

0.500

Step-by-step explanation:

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Q8 Q3.) Solve the system by the substitution method.
inn [45]
Recall that (x+y)^2=x^2+2xy+y^2. So we can add twice the first equation to the second one to get

x^2+y^2+2xy=10+2\cdot3\iff(x+y)^2=16\implies x+y=\pm4

Since xy=3, we have y=\dfrac3x (x\neq0) so

x+y=x+\dfrac3x=\pm4\implies x^2\mp4x+3=0

If x+y=4, then

x^2-4x+3=(x-3)(x-1)=0\implies x=3,x=1\implies y=1,y=3

If x+y=-4, then

x^2+4x+3=(x+1)(x+3)=0\implies x=-1,x=-3\implies y=-3,y=-1

So the solution set is

(x,y)\in\{(-3,1),(1,3),(-1,-3),(-3,-1)\}
3 0
3 years ago
W+2/3=2 5/6 I can't figure out the answer
insens350 [35]
If you're solving for W, your answer is w = 2 1/6

First, we would simplify our fractions:
 w + 2/3 = 2 5/6 =
w + 2/3 = 17/6

Lastly, we subtract 2/3 on both sides of the equation:
w + 2/3 - 2/3 = 17/6 - 2/3 =
w = 13/6 or w = 2 1/6
8 0
4 years ago
What is 3 cups doubled ...?
Jobisdone [24]
<span> 3 cups doubled would mean to multiply by 2 so it's 6 cups</span>
3 0
3 years ago
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3) Tara sold candles to raise money for new playground equipment at her school.
Ronch [10]

Answer:

Tara's current expression finds how much the school will be keeping. 50 x 2/5 (also written as 50 x 0.4) totals out as 20. $20 is 2/5 of $50. The expression that Tara SHOULD have written to find how much goes to the candle company would be 50 x 3/5 (also written as 50 x 0.6), as this adds up to 30. $30 is 3/5 of $50.

Step-by-step explanation:

50/5 = 10 which means that 1/5 of 50 = 10.

2/5 of 50 ($20) is kept by the school. This is what Tara's expression finds. This means that $30 is sent to the candle company, and can be found with the expression 50 x 3/5.

The decimals are created by dividing the numerator of the fraction by the denominator (I find it easier to do math with decimals).

3 0
3 years ago
Please help and and explain
sineoko [7]

Answer:

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
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