Answer:
Step-by-step explanation:
Solve for the value of :
-Multiply both sides by
So, therefore, value of is .
Answer:
- Positive at (-9, 2)
- Negative at ( -oo, -9) or (2, + oo)
Step-by-step explanation:
<u>Given function</u>
<u>Getting zero's</u>
- -2x^2 - 14x + 36 = 0
- x^2 + 7x - 18 = 0
- x = ( -7 ± √(49 +72))/2 = ( -7 ± 11)/2
- x = - 9 and x = 2
<u>As the x^2 has negative coefficient, the function is positive between -9 and 2</u>
<u>And it is negative at:</u>
- x < -9 and
- x > 2
- or
- ( -oo, -9) or (2, + oo)
To factor you have to do this:
s^2 + 9s = -20
+ 20 +20
s^2 + 9s + 20 = 0
now you need to numbers that multiplied give you 20
and then those same 2 numbers have to add to 9
5 x 4 = 20
5+ 4 = 9
(x + 4) (x+ 5)
that means that x= -4, and -5
Answer:
<h2>Each polyhedron</h2>
Step-by-step explanation:
Each polyhedron has lateral faces that are polygons.
Examples of polyhedrons:
<em>prism</em>
<em>rectangular prism</em>
<em>cube</em>
<em>square phyramid</em>
<em>triangular pyramid</em>
<em></em>
First find the difference that went by subtracting the 2 numbers:
340 - 306 = 34
divide that by the number of students that went to the first dance:
34 / 340 = 0.1 = 10% decrease