If u= <4,5> and v= <0,-1>, find 2v+5u
2 answers:
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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.