Number 9, c, e, f can anyone me solve them

9. c.

9. e.

9. f.

Step-by-step explanation:

9. c. Given

Rewrite it as follows:

This inequality is equivalent ot the double inequality

Add 4:

But the absolute value |2x| is always no less than 0, so

9. e. Given

This inequality is equivalent to

So,

9. f. Given

Add 1:

This inequality is equivalent to

So,

d) 48

step-by-step explanation:

16,32,48,64,80,96,112,128,144,160,176,192,208,224,240,256,272,288,304,320,336

b.my answer is b.

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