exam Maths Puzzle Numerical Ability

i need to see how you work this problem with all steps shown:
How many metric tons of chromium must be added to 2.50 metric tons of stainless steel to raise the percent chromium from 11% to 18%?

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exam Other Question
Graph the following; calculate the slope, x-intercept and y-intercept and label the intercepts on a graph.
4.2x+3.8y=1.9

Thanks! I need help with this problem. I can not find any examples in my text book. It says to "change the following to a radical form, then simplify"
49 1/2
I dont even have a formula to follow. Thanks in advance.