exam Maths Puzzle Numerical Ability

the equation of a line on the graph is y= x+245, use this equation to calculate the volume of a gas at 400 degrees Celsius. the x axis is the temperature, and the y-axis on the gra

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I do not understand how to tell when to use combination and when to use permutation. The word problem is: Jack has seven frozen meals in his freezer. How many ways can he choose to have them for dinner Sunday through Saturday? A merchant has three items on sale: namely, a radio for P50, a clock for P30, and a flashlight for P1. At the end of the day, she has sold a total of 100 of the three items and has