How many significant figures are in 2,569

4

Step-by-step explanation:

All non-zero integers are significant.

Any zero BETWEEN two non-zero integers are significant

Any LEADING zeros are insignificant. For example, 0.004, there is only 1 significant figure. The three zeros in front of the 4 are insignificant.

TRAILING zeros are only significant if there is a decimal point. For example:

2,569 has four significant figures but if it said 2,569.0, there would be five significant figures.

b

step-by-step explanation:

the word superfluous means unnecessary

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or