2 years ago

Help me I don't understand the problem

Mathematics

1 answer:

Lelechka [254]2 years ago

8 0

Janajahbdjsjusis. Hqhavavgqgwyywgqhha esta burn jahhabavyhsnskalaisio

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How many inches is 21 cm

Scorpion4ik [409]

21 cm is 8.28 inches.

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3 years ago

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

$(x,y)\in\{(-3,1),(1,3),(-1,-3),(-3,-1)\}$

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3 years ago

A student wants to find the answer to the question “What is the most popular restaurant in Bedford?” He asks 20 randomly selecte

Nadusha1986 [10]

The sample is not going to be accurate because it's at the same restaurant in Bedford and there more likely to say the place there eating at

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3 years ago

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What kind of questions should you ask during an interview

alexdok [17]

Answer:

depends to who ur talking to

Step-by-step explanation:

have fun in your interview

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3 years ago

Find the following dates in the units given:

11Alexandr11 [23.1K]

Answer and step-by-step explanation:

a. 4 litres in 5 minutes (litres per minute)

4 litres per 5 minutes means 4/5 litres per 1 min = 0.8 litres per minutes

b. 12 litres in 45 minutes = 12/3 litres in 45/3 minutes = 4 litres per 15 minutes

60 minutes = 4*15 minutes

4 * 4 = 16 litres per hour

c. 800 kilowatt hours in 2 months

1 year = 12 months = 2*6 months

kilowatt per year = 800 * 6 = 4800 kilowatt per year

Hope this helped :3

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3 years ago