(5 1/4) divieded by (-2 1/2)
2 answers:
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Answer:
where y is positive.
The 2y in the denominator is not inside the fourth root
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Work Shown:
The idea is to get something of the form in the denominator. In this case,
To be able to reach the , your teacher gave the hint to multiply top and bottom by
For more examples, search out "rationalizing the denominator".
Keep in mind that only works if y isn't negative.
If y could be negative, then we'd have to say . The absolute value bars ensure the result is never negative.
Furthermore, to avoid dividing by zero, we can't have y = 0. So all of this works as long as y > 0.
Answer:
BC = 30.73
Here,
so first solve for QD
- Hence, QD = 9
Now! <u>using Pythagoras theorem,</u>
- CD² + BD² = BC²
- 19.2² + (9+15)² = BC²
- BC = √368.64+576
- BC = 30.73499634
- BC = 30.73 ( rounded to nearest hundredth )