3 years ago

What is the perimeter of quadrilateral DOBC

Mathematics

1 answer:

rosijanka [135]3 years ago

7 0

No one see the quadrilateral

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2/9 of the students in a school are in sixth grade.

IRISSAK [1]

There are 20 students in sixth grade

Step-by-step explanation:

Step 1: Find the number of sixth-graders in the school.

Total number of students = 90

Number of sixth-graders = 2/9 of total students

⇒ Number of 6th graders = 2/9 × 90 = 20 students

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otez555 [7]

The answer should be X equal 5

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Leya [2.2K]

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Lorico [155]

$x=y^2+4y\\ y^2+4y-x=0\\\Delta=4^2-4\cdot1\cdot(-x)=16+4x\\\\
1.\ \Delta0\\
\sqrt{\Delta}=\sqrt{16+4x}=\sqrt{4(4+x)}=2\sqrt{x+4}\\
y_1=\frac{-4-2\sqrt{x+4}}{2\cdot1}=-2-\sqrt{x+4}\\
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$x=y^2+4y\\ y^2+4y-x=0\\
y^2+4y+4-4-x=0\\
(y+2)^2=x+4\\
y+2=\sqrt{x+4} \vee y+2=-\sqrt{x+4}\\
y=-2+\sqrt{x+4} \vee y=-2-\sqrt{x+4}\\$

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3 years ago

5. Rebecca is 6 years older than three times Andrew's age. The sum of their ages is 18. How old is Rebecca?

anygoal [31]

Answer:

Rebecca is 18

Step-by-step explanation:

18/6-3=0

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