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harina [27]
3 years ago
7

7) 5x – 3y – 4z = 24 5x + 3y + 5z = 27 4x - 3y + 5z = 28

Mathematics
1 answer:
OLEGan [10]3 years ago
8 0

Answer:

Step-by-step explanation:

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An urn contains r red balls and b blue balls. One ball is selected at random from this urn, its color is recorded and it is retu
nadezda [96]

Answer:

Zero

Step-by-step explanation:

The probability of the ball being red after first selection is = (r) ÷ (r+b)

The probability of the ball being blue after first selection is = (b) ÷ (r+b)

If the ball selected is red, the total number of balls after its returned together with m number of red balls is = r+b+m

The probability of the  selection doesn't depend on the second selection, hence condition probability is zero.

However the probability of the second selection depends on the first selection.

5 0
3 years ago
What is 30 percent of 25
sweet [91]
7.5 is 30 percent of 25 because

25 divided by 10 is 2.5 times 3 is 7.5
6 0
3 years ago
Plz help me with 13-16
svetlana [45]

Answer:

13) x = 10

14) x = 22

15) x = 12

16) x = -15

Step-by-step explanation:

13) 4x+5x=9x;90/9=10

14) 45-1=44;44/2=22

15) 37-1=36;36/3=12

16) -54+26=-28;x-28=3x+2;x=-15

6 0
3 years ago
which situation would be represented by a discrete probability distribution? a) the weight of fire fighters b) the overall avera
IgorC [24]
A discrete variable is a variable which may take only certain discrete values; for example the number of people in a household is a discrete variable which may have the value 1, 2, 3, etc. but cannot have intermediate values such as 1.473 or 3.732.
Choice d) can be represented by a discrete probability distribution, the other choices cannot be so represented.
4 0
3 years ago
What is the point-slope form of the equation of a line that passes through the point (6, −8) and has a slope of −2?
Vilka [71]
General\ equation\ for\ line\ in\ slope\ intercept\ form:\\\\y=ax+b\\\\
a-\ slope\\a=-2\\\\y=-2x+b\\\\Substitute\ point\ (6,-8)\\\\
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-8=-12+b\ \ \ |Add\ 12\\
4=b\\\\
Equation\ of\ line:\\
y=-2x+4.
5 0
3 years ago
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