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21.05.2020 •
Mathematics
Jamar is attempting to factor the expression 15x^2-16x-15. In his first step, he rewrites the expression as 15x^2-25x+9x-15. Which of the following statements in true about jamars work?
A.
jamars first step is correct. He should continue to factor the expression.
B.
The two middle coefficients add to the correct number, but do not multiply to the correct number.
C.
The two middle coefficients multiply to the correct number, but do not add to the correct number.
D.
The two middle coefficients do not add or multiply to the correct number.
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Ответ:
Area = 132 Square units
Step-by-step explanation:
Looking at the diagram, the top horizontal chord distance that's missing is calculated as;
21 - (9 + 3) = 9 units
Total distance of top horizontal chord = 9 + 3 = 12 units
Now, formula for area of trapezium is;
Area = ½(a + b)h
Where h is height = 8 units
The parallel sides are a & B.
In this case; a = 12 units
b = 21 units
Thus;
Area = ½(12 + 21)8
Area = 4 × 33
Area = 132 Square units