The rules of significant figures are: 1. all non zeros are significant. 2. trailing zeros are significant. 3. zeros between non-zeros are signifincant. Hence, applying these to the given. 
A. 4 sig figs
B. 1 sig fig
C.6 sig figs
D.1 sig fig
        
             
        
        
        
6.25 because 2.5+2.5= 5 and then half of 2.5 is 1.25 so 6.25
        
             
        
        
        
Answer:
1.38 to the nearest hundredth.
Step-by-step explanation:
Dividing:
 x + 1 ) 3x - 1 ( 3             
           3x + 3
                 -4 
so (3x - 1) / (x + 1) =  3  - 4 / x+ 1
Integral  of (3  - 4 / x+1 )  = 3x - 4 ln(x + 1)
Between  limits of 1 and 2 we have:
(3(2) - 4 ln 3) - (3 - 4 ln2)
=  1.6056 - 0.2274
= 1.3782.
 
 
        
             
        
        
        
Answer:
See step by step answer
Step-by-step explanation:
the factors are (x+22)(x-10)=0
so x = -22 and 10, but a dimension cannot be negative, so the answer for x is 10 and then if you plug it back in the dimensions are 4 cm, 11 cm and 21 cm.
When you multiply 4 * 11 * 21 = 924, so you know it's correct.