Hey guys...I need help again...
2 answers:
Answer:
A is 10.0 inches.
B is 35 inches.
Step-by-step explanation:
To find the answers, we can just multiply our original lengths by our scale factor.
Our original width is 8 inches.
This means that our new width, A, will be our old width multiplied by our scale factor.
So:
Similarly, for our length, our old length is 28 inches. This means that our new length is:
And we're done!
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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:
-\frac{7}{6}
Step-by-step explanation:
We can use the slope formula for the segment that joins any two points and
:
which in our case gives: