If Jan can buy 12 copies of a certain book for $40, what is the unit rate for cost per copy? How much
1 answer:
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Refer to the attached image.
Given the rectangle ABCD of length 'l' and height 'h'.
Therefore, CD=AB = 'l' and BC = AD = 'h'
We have to determine the area of triangle AEF.
Area of triangle AEF = Area of rectangle ABCD - Area of triangle ADF - Area of triangle ECF - Area of triangle ABE
Area of triangle ADF =
=
=
Area of triangle ECF =
=
=
Area of triangle ABE =
=
=
Now, area of triangle AEF =
Area of rectangle ABCD - Area of triangle ADF - Area of triangle ECF - Area of triangle ABE
=
=
=
=
= 27 units
Therefore, the area of triangle AEF is 27 units.
Answer:
Step-by-step explanation:
We are given ,
and
are zeros of the function. We can use the sum and product of roots. You may have come across these equations before ↓
Since the coefficients are already in a, b, and c's, we do not need to sub in anything else.
Now, you are asked to evaluate . The next step after finding the roots above ↑, is to factorise this equation to be solved.
=
Sub in each respective roots,
=
=
Hope this helped! Ask me if there's any part of the working you don't understand :)