Answer:
a 4
b 3
c 9
d 4
Step-by-step explanation:
id.k
Answer:
9 1/7
Take 5 4/7 + 3 13/21 and get 9 1/7
The possible values of N from the given probability parameters is; N equals 15 or 21
<h3>How to Solve Algebra Problems?</h3>
We are told that;
Number of pens in the box = N
Let the number of red pens be x
Thus; number of black pens = x + 3
Thus;
x + x + 3 = N
x = (N - 3)/2
The probability that she will take a black pen followed by a red pen is;
P(she will take a black pen followed by a red pen) = (x + 3)/N * x/(N - 1)
Plugging in he relevant values and solving for N gives ;
Solving for N gives N equals 15 or 21
Read more about Algebra at; brainly.com/question/723406
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Arc length = radius* angle theta (in radians)
So angle 90 degree = 90*pi/180 radians= pi/2 radians
So arc length = 7.5* pi/2 cm = 11.8cm
So option A is correct.
the equation is:
now we can add 3 units in bout sides of the equation so:
and finally we can multiply the equation -1 so:
