exam Maths Puzzle Numerical Ability

6x^2 -5x +1 factoring

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Please help me solve my assignment..
my questions are:

1). -3 1/4 + 1/2 =

2). 3 + -4/5 =

3). -2 1/8 + -1 1/4 =

4). -25 + -17/3 =


thank you...
Business and finance. When x number of units are sold, the price of each unit (in dollars) is given by p= -x/2+75. Find the unit price when the following quantities
are sold: 2, 7