Answer:
-2-2√3, -2+2√3
Step-by-step explanation:
Let x and y be two numbers.
Let x represent one of the numbers. Then the other number is -4-x. We want the product to be -8:
x(-4-x) = -8
-4x -x^2 = -8 . . . . . eliminate parentheses
x^2 +4x = 8 . . . . . . multiply by -1
x^2 +4x +4 = 12 . . . add 4 to complete the square
(x +2)^2 = 12
x +2 = ±√12 = ±2√3
x = -2±2√3
The answer is D.) 23. First you subtract 12 from both sides of the equation. You will get 0.35x=8.05. Then you divide both sides by 0.35 to get x=23.
The formula for area of a circle is Area = PI x r^2
The radius (r) is given as 9 meters.
The value of PI is given as 3.14
Area = 3.14 x 9^2
Area = 3.14 x 81
Area = 254.34 m²
I believe you just multiply the number of students by the number of students in each combination
30*6= 180 combinations