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kirill [66]
3 years ago
8

The cylindrical block has a height of 4 inches and a radius of 2 inches find the total surface area of the block

Mathematics
1 answer:
Rasek [7]3 years ago
3 0

Answer:

75.4 square inches

Step-by-step explanation:

The cylindrical block has a height of 4 inches and a radius of 2 inches find the total surface area of the block

The formula for the Total surface area of a cylinder

= 2πr (r + h)

= 2 × π × 2( 2 + 4)

= 75.398223686 square inches

= 75.4 square inches

The total surface area of the cylindrical block is 75.4 square inches.

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3 years ago
Use the distributive property to expand the expression. −2(5a − 3b2) − 4b + 3 A) −10a + 6b2 − 4b + 3 B) −10a − 6b2 − 4b + 3 C) −
Nikolay [14]
The answer is:  [B]:  " -10a + 6b² − 4b + 3 " .
_____________________________________
Explanation:
____________________
Given:
____________________________
  -2(5a − 3b²) − 4b + 3 ;  
_________________________________
    "Use the distributive property [of multiplication] to expand the expression."
______________________________________________
Note the distributive property of multiplication:
______________________________________________
           a(b + c) = ab + ac ;
           a(b − c) = ab − ac ;
______________________________________________
So, we have:  " -2(5a − 3b²) − 4b + 3 "  ;
______________________________________________

Start  with:  " -2(5a − 3b²) " ; 
______________________________________________ 
 
   -2(5a − 3b²)  =  (-2*5a) − (-2*3b²)  =  (-10a) − (-6b²)
 
           =  -10a + 6b²
________________________________________________
        → Now, bring down the rest of the problem; 
________________________________________________
  -10a + 6b² − 4b + 3 ;  which is:  Answer choice:  [B].
________________________________________________
8 0
4 years ago
Read 2 more answers
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