How many significant figures are in the number 5.6 x 10-4 ?

One positive number is 9 more than twice another. if their product is 95, find the numbers

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years

Hich equation can pair with x + 2y = 5 to create an inconsistent system? 2x + 4y = 3 5x + 2y = 3 6x + 12y = 30 3x + 4y = 8