Answer:
20
Step-by-step explanation:
add 3ft+3ft+11ft+3ft and that's your answer
Point R, as it is the intersection.
[If you can't type fractions, then instead of 24/8, do 3]
The first missing value is 3 or 
= 
The second missing value is 24 (because 3 times 8 is 24)
= 
Make the denominators the same in order to add them together
= 
The third missing value is 29
A quadratic function is given by y = ax^2 + bx + c
c(2) = a(2)^2 + 2b + c = 45
4a + 2b + c = 45 . . . (1)
c(4) = a(4)^2 + 4b + c = 143
16a + 4b + c = 143 . . . (2)
c(10) = a(10)^2 + 10b + c = 869
100a + 10b + c = 869 . . . (3)
Solving (1), (2) and (3) gives a = 9, b = -5, c = 19
Therefore, c(x) = 9x^2 - 5x + 19
c(7) = 9(7)^2 - 5(7) + 19 = 9(49) - 35 + 19 = 441 - 16 = 425
Therefore, it costs $425 to produce 7 calculators.
