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juin [17]
3 years ago
10

A class has 17 girls and 4 boys. A teacher needs something from the front office, so selects a student at random to go. Before t

hat student comes back, another teacher drops in and selects another student at random for another task. What is the probability that a girl was selected both times?
Mathematics
1 answer:
muminat3 years ago
5 0

Answer:

I think it's like 81%

Step-by-step explanation:

17 /21=.809

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Working alone, Dan can do a certain job in three hours and Stan can do the same job in two hours. At these rates, how long would
Liono4ka [1.6K]

Answer:

2 hours and thirty minutes

Step-by-step explanation:

3+2=5

5/2=2.5

4 0
3 years ago
Jessica had $150 in her savings account after her first week of work. She then started adding $35 each week to her account for t
Fofino [41]
35w + 150 = s

$185, $220, $255, $290, $325

(Add $35 each week for 5 weeks)
6 0
3 years ago
Write an equation in slope-intercept form for the line that passes through (5,0) and is perpendicular to the line described by y
natta225 [31]

For this case we have to;

We have that an equation in slope-intercept form is given by:

y = mx + b

Where:

m is the slope

b is the cut point with the y axis

Also, by definition, two lines are perpendicular when the product of their slopes is -1. That is:m_ {1} * m_ {2} = - 1

We have the line as data: y_ {1} = \frac {-5} {2} x + 6

Then m_ {1} = \frac {-5} {2}

We foundm_ {2}:

m_ {1} * m_ {2} = - 1

\frac {-5} {2} * m_ {2} = - 1

m_ {2} = \frac {-1} {(\frac {-5} {2})}

m_ {2} = \frac {(2) (- 1)} {(- 5) (1)}

m_ {2} = \frac {2} {5}

Thus, y_ {2} = \frac {2} {5} x_ {2} + b_ {2}

We must find b_ {2}:

We know that y_ {2} passes through the point(x_ {2}, y_ {2}) = (5,0)

We substitute the point in the equation of y_ {2}:

0 = \frac {2} {5} (5) + b_ {2}\\0 = 2 + b_ {2}\\b_ {2} = - 2

Thus, y_ {2} = \frac {2} {5} x_ {2} -2

Then the equation in slope-intercept for the line that passes through (5,0) and is perpendicular to the line described by y_ {1} = \frac {-5} {2} x_{1} + 6 is: y_ {2} = \frac {2} {5} x_ {2} -2

Answer:

y_ {2} = \frac {2} {5} x_ {2} -2


7 0
3 years ago
Please help soon!
Jlenok [28]

Answer:

a) Translate the graph of f(x) down 3 units.

b) (8,-1) is a point on the graph of g(x)

Step-by-step explanation:

The transformations that subtract a constant number of units from the functional expression f(x) are transformations that lower the graph of the function in those many units,

Therefore they correspond to a translation of the original graph down the number of units involved.

In this case, the number of units involved is "3" (due to the "-3" added to the expression for f(x). So he correct answer for the first part is: Translate the graph of f(x) down 3 units.

For the second part, one has to try each of the coordinate pairs given in the new function g(x) to see which one results in a true statement:

1) Testing (-8,-1) by checking if replacing x with the value "-8" renders "-1" for the y-value: g(x)=\sqrt[3]{x} -3\\g(-8)=\sqrt[3]{-8} -3\\g(-8)=-2-3\\g(-8)=-5

so this is NOT a point on the graph of g(x).

2) Testing (-1,-2) by checking if replacing x with the value "-1" renders "-2" for the y-value: g(x)=\sqrt[3]{x} -3\\g(-1)=\sqrt[3]{-1} -3\\g(-1)=-1-3\\g(-1)=-4

so this is NOT a point on the graph of g(x).

3) Testing (2,-1) by checking if replacing x with the value "2" renders "-1" for the y-value: g(x)=\sqrt[3]{x} -3\\g(2)=\sqrt[3]{2} -3\\

the cubic root of 2 is not a rational number, because 2 is not a perfect cube, so the expression cannot be reduced, so this is NOT a point on the graph of g(x).

4) Testing (8,-1) by checking if replacing x with the value "8" renders "-1" for the y-value: g(x)=\sqrt[3]{x} -3\\g(8)=\sqrt[3]{8} -3\\g(8)=2-3\\g(8)=-1

Therefore this pair (8,-1) IS a point on the graph of g(x).

5 0
3 years ago
Read 2 more answers
What’s the difference in weight between the heaviest and lightest dog . Lassie 21 kg 249g Riley 23 kg 128g Fido 21,268g
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Just Subtract Riley ( 23 kg 128g ) minus Lassie ( 21kg 249g ) and then you get your difference
4 0
3 years ago
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