There are
ways of pairing up any 2 members from the pool of 
contestants. Note that
so that
Answer:
which 2 equations
Step-by-step explanation:
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need full information
Solution: Let x be the height of a student in Marta's class.
The mean height of 18 students in Marta's class is 60 inches
We know that:
Therefore, the total measure of all 18 student's heights is 1080 inches
Answer: 13= 3.75
Step-by-step explanation: \
−4.5=−1.2k
Divide both sides by −1.2.
−1.2
−4.5
=k
Expand
−1.2
−4.5
by multiplying both numerator and the denominator by 10.
−12
−45
=k
Reduce the fraction
−12
−45
to lowest terms by extracting and canceling out −3.
4
15
=k
Swap sides so that all variable terms are on the left hand side.
k=
4
15
radius is the distance from the centre of a circle to any given point on its circumference, diameter is the length between two points that are the furthest possible from each other on the circle's circumference.
The diameter is twice the radius.
Therefore, if the radius is 12in then the diameter is 24in.
