Answer:
=m2+6mn+9n2
Step-by-step explanation:
=(m+3n)(m+3n)
=(m)(m)+(m)(3n)+(3n)(m)+(3n)(3n)
=m2+3mn+3mn+9n2
 
        
             
        
        
        
Answer:
   180 cm^2
Step-by-step explanation:
For similar figures the ratio of areas is the square of the ratio of linear dimensions. 
We take "tripled in size" to mean that the linear dimensions of the larger rectangle are 3 times those of the smaller rectangle. That means the area of the larger rectangle will be 3² = 9 times the area of the smaller one.
   Area = (3²)(20 cm²) = 180 cm² . . . . area after tripled in size
 
        
             
        
        
        
Answer:
The fourth term of the sequence B(4) =-8
The sequence is 1,-2,4,-8...
Step-by-step explanation:
<u><em>Explanation:-</em></u>
Given that the sequence
      B(n) = 1(-2)ⁿ⁻¹
Put n=1
     B(1) = 1(-2)¹⁻¹ = 2⁰ =1
Put n=2
    B(2) = 1(-2)²⁻¹ = (-2)¹ =-2
Put n=3
   B(3) =1(-2)³⁻¹ = (-2)² =4
Put n=4
 B(4) = 1(-2)⁴⁻¹ =(-2)³ =-8
The sequence 
1,-2,4,-8...
 
        
             
        
        
        
Answer: 4,032
Step-by-step explanation:
8,4 x 0,48 = 4,032
 
        
             
        
        
        
Answer: 3 or the whole backyard 
Step-by-step explanation: In a hour she can rack 3 backyard. The question asked that how much of a backyard can she rake in 1 hour. She can rake the whole backyard in a hour.