19.64851 2 s .f help please

20

Step-by-step explanation:

19.64851 to 2s.f

To 2 significant figures

Looking at the digit behind the decimal

It is 6,meaning it is more than 5

So you round up to 1 and add to the digit in front

=20

3< x< 5

step-by-step explanation:

|x - 4| < 1

there are two solutions, one positive and one negative.   remember to flip the inequality when taking the negative solution

x-4 < 1       x-4 > -1

add 4 to each side

x-4+4 < 1+4       x-4+4 > -1+4

x< 5                 x> 3

3< x< 5

25 questions , because they start with 100.  

350-100=250 .  

. 250/10=25

step-by-step explanation:

first take off 100, then what x 10 = 250? that is your answer. (25)