If you look at the quadratic formula:
x=(-b±√(b^2-4ac))/(2a)
We can say that -b=5, b=-5
If I read it right you had ±2√7 which is equal to ±√28, and we know b=-5 so:
±√(25-4ac)=±√28
And since 3=2a, a=1.5 making the above:
±√(25-6c)=±√28
25-6c=28
-6c=3
c=-0.5
So a=1.5, b=-5, and c=-0.5 thus
y=1.5x^2-5x-0.5
We can check this by reapplying the quadratic formula to the equation above
x=(5±√(25-4(1.5)(-0.5))/3
x=(5±√(25+3))/3
x=(5±√28)/3
x=(5±√(4*7))/3
x=(5±2√7)/3
It’s D because all of the square is shaded
40% of the espressos were single-shot
22+33=55 total shots
22/55= .4
.4x100
40%
Answer:
Edg.enuity answers
Step-by-step explanation:
1. Atmosphere- 8.90118
2. Oceans- 2.44346
3. Crust- 4.53786
4. Inner Core- 1.68861
5. Outer Core- 3.20268
6. Mantle- 7.05637
Slope= Ya-Yb/Xa-Xb
Slope= 5+3/2+3
Slope=8/5
Equation: y-ya=slope(x-xa)
Equation: y-5=8/5(x+3)
Then D is the correct answer