I got this question wrong on my College Algebra test and i don't know why it is wrong. please help.

Question

I got this question wrong on my College Algebra test and  i don't know why it is wrong. please help.

anonymous · Answer

Write in interval notation...
$$-7 \le x < 9$$


and i put 

$$[-7, \infty) (-\infty, 9)$$

How is this wrong?

anonymous · Answer

@hartnn  can you help explain this please

kropot72 · Answer

Put into words, the expression says:
x is equal to or greater than negative 7, and x is less than 9.

jackthegreatest · Answer

first of all, x does not go on to infinite

jackthegreatest · Answer

i just had this lesson in math

hartnn · Answer

which also means x is between -7 and 9 (-7 included)

what you answered meant: x is greater than -7 till infinity, and x is less than 9 till -infinity

kropot72 · Answer

You can find how to express this here: http://www.mathwords.com/i/interval_notation.htm

jackthegreatest · Answer

the answer should be [-7,9)
i am almost certain

hartnn · Answer

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