book Maths Puzzle Numerical Ability

The enrollment in a small community college is 4288. If 49% are females estimate the number of females enrolled I need help

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let F be the subfield of complex numbers and let T be the function from F^3 into F^3 defined by T(x1,x2,x3)=(x1-x2+2 x3,2 x1+x2,-x1-2 x2+2 x3)
a)verify that T i
Patton walked part of the 76 miles to the site of a battle and rode the rest of the way on a caisson. He walked at 4 mph and rode at 15 mph. if the total time of the trip was eight