Answer:
48
Step-by-step explanation:
5 x^2 +x
Let x = 3
5 * 3^2 +3
Exponents first
5 * 9+3
Multiply next
45+3
48
 
        
                    
             
        
        
        
Answer:
length = 115 cm 
width = 108 cm
Step-by-step explanation:
The perimeter of a rectangular swimming pool is 446 centimeters
LEt L be the length of the pool
The width of the pool is 7 centimeters less than the length of the pool.
width = length - 7
W= L-7
Given perimeter = 446
Perimeter of rectangle = 2(length)+2(width)
446 = 2(L) + 2(W)                    we know W = L-7
446 = 2(L) + 2(L-7)    
446 = 2L + 2L - 14
Add 14 on both sides
460 = 4L
divide by 4 on both sides
L= 115
Length L= 115
Width W = L - 7 = 115 - 7= 108
 
        
             
        
        
        
Y-3=5(x-2)
y-3=5x-10
y=5x-13
the slope is 5
        
                    
             
        
        
        
Multiply the dimensions by 3 to convert to feet.
12 x 3 = 36 ft. 
15 x 3 = 45 ft. 
the dimensions are 36 ft. x 45 ft.
        
             
        
        
        
Answer:
10
Step-by-step explanation:
h(x)=4x-2                         h(x)=3
h(3)=4(3)-2                     substitute
h(3)=12-2                        multiply
=10                                subtract