step function algebra

Solve for f(x)
1)Change the parameters, find the graph of [math]f\left(x\right)=2\left[x+1\right]-4[/math][br]Read the value of [math]f\left(3.2\right)[/math]
2)Change the parameters, find the graph of [math]f\left(x\right)=2\left[\frac{1}{3}\left(x-1\right)\right]-4[/math][br]Read the value of [math]f\left(3.2\right)[/math]
3)Change the parameters, find the graph of [math]f\left(x\right)=2\left[-2\left(x+1\right)\right]-3[/math][br]Read the value of [math]f\left(3.2\right)[/math]
4)Can you solve the problem without the graph?
Solve for x
1)Change the parameters, find the graph of [math]f\left(x\right)=2\left[-2\left(x+1\right)\right]-3[/math][br]Read the interval of [math]f\left(x\right)=1[/math]
2)Change the parameters, find the graph of [math]f\left(x\right)=-0.4\left[2\left(x-3\right)\right]+0.8[/math][br]Read the interval of [math]f\left(x\right)=0[/math]
3)Change the parameters, find the graph of [math]f\left(x\right)=\left[x\right][/math][br]Read the interval of [math]f\left(x\right)=2[/math]
Can you solve for x without the graph?
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Information: step function algebra