exam Maths Puzzle Numerical Ability

Simplify:
(6x^2 +4x-10)-(4x^2 -6x+4)

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Robert is on a diet and can have 500 calories for lunch. A 3-ounce hamburger on whole wheat bread has 315 calories, and 12 fluid ounces of soda has 145 calories. How many French fries can he eat if there are 10 calories in one French fry? how do you solve this word problem:THE MODEL C(X)=95+35X REPRESENTS THE COST IN DOLLARS OF RENTING A CAR, WHERE X IS THE NUMBER OF DAYS THE CAR WAS RENTED. wHAT IS THE SLOPE FOR TH