1. Rational
2. Irrational
3. Irrational
4. Irrational
5. Rational
Required inequality is 1.5x + 3 < 18 and solution is x < 10, that is number of months svetlana can allow her hair to grow must be less than 10 so that her hair length will be less that 18 cm
<u>Solution:</u>
Given that
Svetlana's hair is 3 cm long.
Her hair grows 1.5 cm per month
Need to write an inequality to determine the number of months Svetlana can allow her hair to grow.
Let assume number of months Svetlana can allow her hair to grow be represented by variable "x"
Length of hair grows in one month = 1.5 cm
So Length of hair grows in "x" months = 
As Svetlana wanted her hair to be less than 18 cm long
So Length of hair grows in "x" months plus current length of hair must be less than 18 cm
=> 1.5x + 3 < 18
On solving the above inequality for "x" we get ,
1.5x < 18 – 3
=> 1.5x < 15
=> 
=> x < 10
Thus required inequality is 1.5x + 3 < 18
Number of months sultana can allow her hair to grow must be less than 10 so that her hair length will be less that 18 cm.
'Vertex form', having just googled it, is another name for completing the square, which I have done extensively at school. This involved converting:
f(x) = ax^2 + bx + c --> f(x) = a(x-b)^2 + c
In the completed-square form, (b, c) are the co-ordinates of the vertex (which is the maximum/minimum point). So for part a:
- Here is the original
f(x) = x^2 + 12x + 11
- Halve the x-coefficient (the number before x) and use it as -b in the vertex form described above. You must then calculate the square of this number and minus it at the end because when you multiply it out, this is the surplus you will make along with x^2 + 12x:
f(x) = (x + 6)^2 - 36 + 11
- Tidy this up by collecting the constant (just number) terms together:
f(x) = (x + 6)^2 - 25
- Using the form a(x - b)^2 + c, we can work out that b = -6 (because -b = 6) and c = -25. This gives us the vertex (-6, -25) which is a minimum point because the graph is a positive quadratic, giving us the characteristing 'U' shape which has a bottom. If it were a negative quadratic (denoted by a negative x^2 coefficient), the vertex will be a maximum point because it has an 'n' shape instead.
- To solve the equation from here, make the function equal to zero:
(x + 6)^2 - 25 = 0
- Then take 25 to the other side:
(x + 6)^2 = 25
- Next, square-root both sides:
x + 6 = <span>±5
- Rearrange to finish:
x = -6 </span><span>± 5 = -1 or -11
- Therefore, the roots (solutions) to the equation x^2 + 12x + 11 = 0 are x = -1 or -11
This method will work the same for the other equations up there too, so I will leave them for you to do.
I hope this helps
</span>
Answer:
X^2-11x+28
Step-by-step explanation:
Answer:
height = 10.5 cm (for open-top container)
Step-by-step explanation:
The area of the base is ...
A = πr²
The lateral area is ...
A = 2πrh
We want the ratio of these to be 1:6, so we have ...
πr²/(2πrh) = 1/6
6πr² = 2πrh . . . cross multiply
h = 3r . . . . . . . divide by 2πr
h = 3(3.5 cm) = 10.5 cm
The height is 10.5 cm.
