book Maths Puzzle Numerical Ability

The difference between two numbers is 4. Twice the larger number is 11 more than 3 times the smaller number. Find the numbers.

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book Other Question

if f(x)=4x-3, find the following (solve it for a numerical answer):
f(-1)
looking desperately for the answer to this:

6x to the second power - 12x - 18 = ????

Please help... thank you, krista m pooler