exam Maths Puzzle Numerical Ability

how do you evaluate this equation step by step: 6!-4!

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exam Other Question

In the year 1998, there were -4.57 times 10 to the 7th power- cars in America. The population of America was -2.3 times 10 to the 6th power-. What was the average number of cars per person in America in 1998?
A. 0.5
B. 1.98
C. 5
D. 19.8 At 2:00 pm, two cars start toward each other from towns 240 miles apart. If the rate of one car is 10 mph faster than the other, how fast does each car go, if they meet at 5:00 P.M.?