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3 years ago

12

5-3(n+4)-2.....please help

1 answer:

ELEN [110]3 years ago

4 0

Answer:

-3n-9

Step-by-step explanation:

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4 years ago

Value of the expression 9.7+(- 5.4)

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Find the area in cm2 of a rhombus whose side length is 29 cm and

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$a=1;\ b=2;\ c=-1680\\\\\Delta=b^2-4ac\to\Delta=2^2-4\cdot1\cdot(-1680)=4+6720=6724\\\\\sqrt\Delta=\sqrt{6724}=82\\\\d_1=\frac{-b-\sqrt\Delta}{2a}\to d_1=\frac{-2-82}{2\cdot1} < 0\\\\d_2=\frac{-b+\sqrt\Delta}{2a}\to d_2=\frac{-2+82}{2\cdot1}=\frac{80}{2}=40\ (cm)\\\\d=40cm;\ d+2=42cm\\\\A_r=\frac{d(d+2)}{2}\to A_r=\frac{40\cdot42}{2}=840\ (cm^2)$

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4 years ago