Answer:
A. 20
Step-by-step explanation:
because she has twice as many and if you have twice as many then you'll have 40 so 40+20=60
 
        
                    
             
        
        
        
Yes, 90 is 1/10 of 900
Because
90 = 1/10 x 900
90 = 90
        
             
        
        
        
The height of the model in inches would be 6. if you multiply 30 until it reaches 180 you will have 6.
        
             
        
        
        
57. 8
58. 8
59. 24
60. 11.25 or 11
61. 20.52 or 21
62. 144
63. 7.37 or 7
64. 50%
65. 25%
66. 10%
67. 20%
68. 25%
hope this helped :)
        
             
        
        
        
Answer:
Step-by-step explanation:
Part A
We will use the slope intercept form of the line and then convert later.
Equation
y = mx + b is the general form
Givens
Two data points
(4,180)
(9,325)
Solution 
325 = 9x + b
<u>180 = 4x + b</u>                Subtract
145 = 5x                      Divide by 5
145/5 = 5x/5               Do the division
29 = x                          This represents the cost / day
180 = 4x + b                 Substitute x = 29 to find b
180 = 4*29 + b             Combine
180 = 116 + b                Subtract 116 from both sides.
180 - 116 = b
64   = b
Solution for y = mx + b
y = 29x + 64
In Standard form this is 
- 29x + y = 64 But the first number must be plus
29x - y = - 64 <<<< Answer A
Part B
y = 29x + 64
f(x) = 29x + 64
Part C
The graph is shown below. Various points are filled in using y = 29x + 64. The y intercept is (0,64) which is labeled. Let x = 1 , 2, 3, 4, ... 10 (which is arbitrary). This may be more easily done on a spreadsheet if you know how to use one to make graphs.