The square root of 195 is 13. 195 squared (195×195) is 38,025. I do not know which way you needed it but I put both situations just in case.
Let
be the 20 marks of the boys, and
be the 10 marks of the girls.
We know that the global mean was 70, meaning that

Multiplying both sides by 30 we deduce that the sum of the scores of the whole classroom is

By the same logic, we work with the marks of the boys alone: we know the average:

And we deduce the sum of the marks for the boys:

Which implies that the sum of the marks of the girls is 
And finally, the mean for the girls alone is

Answer:
it descended 31 Feet b b b b b b b b b bb b b b b b b b b b b
Answer:
20 units
Step-by-step explanation:
s = 8
Perimeter = s + s + 

= 8 + 8 + 4
= 20 units
A construction is a geometric drawing that uses a limited set of tools, usually a compass and straightedge. You can ... compass and straightedge (a ruler without marks) to construct a segment that is congruent to a given segment, and an ... CRITICAL THINKING: Describe how you could use a compass and a straightedge to.
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