C. neither
3. Suppose that x and y vary inversely, and x = 8 when y = 10. Write the function that models the inverse
variation.
80
18
y =
a.
x
C.
b.
y = 1.25x
d. y =
2
X
when c= 5. Write a function that models the inverse
4. Suppose that c and d vary inversely and that d =
variation and find d when c = 10.
1
a.
d =
c.
3c" 15
55
b. d =
d.
25 5
d =
30' 6
55
d =

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?

Each of the following data sets has a mean of x = 10. (i) 8 9 10 11 12 (ii) 7 9 10 11 13 (iii) 7 8 10 12 13 (a) without doing any computations, order the data sets according to increasing value of standard deviations. (i), (iii), (ii) (ii), (i), (iii) (iii), (i), (ii) (iii), (ii), (i) (i), (ii), (iii) (ii), (iii), (i) (b) why do you expect the difference in standard deviations between data sets (i) and (ii) to be greater than the difference in standard deviations between data sets (ii) and (iii)? hint: consider how much the data in the respective sets differ from the mean. the data change between data sets (i) and (ii) increased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). the data change between data sets (ii) and (iii) increased the squared difference îł(x - x)2 by more than data sets (i) and (ii). the data change between data sets (i) and (ii) decreased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). none of the above

The function f(x)= x5+ ( x + 3)2 is used to create a table. if x = -1 then what is f(x)?