algebra
posted by HG on .
Can you help see if I am arriving at the right answers?
1. F(x) =5x^22x
F (0), I got o
F (1) I got 7
F (2) I got 16
2. 0.4x<16
I got x>40
3. 8x(5x+7) =14
My answer: 7/3
4. 19<=3x8<=7
My answer: 11/3<=x<=3

1. Correct
2. Correct
3. Check your signs on the distribution.
4. 11/3 <= x <= ?
Check your algebra. 
I am still getting 3 what am I doing wrong
3x8<=7
3x+88<=7+8
3x<=1
3/1=3
x<=3 
You are correct until the step 3x <= 1.
3x * (1/3) <= 1 * (1/3)
x <= 1/3 
Oh my gosh I completely missed that, thank you.