book Maths Puzzle Numerical Ability

what are these things i can never get them right??

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book Other Question

The degree three polynomial f(x) with real coefficients and leading
coefficient 1, has 4 and 3 + i among its roots. Express f(x) as a
product of linear and quadratic polynomials
An employee of the computer store is paid a base salary of $1,175 per month plus a 5% commission on all sales during the month. How much must this employee sell in one month to earn a total of 3,170 for the month