Exercise 1 8,9
1.
The variables x and y are connected by the equation y = 2x2 - 4x - 1.
Complete the table for y = 2x2 - 4x - 1.
3
4
-2
-1
2
0
1
у
(ii) Draw the graph of y = 2x2 - 4x – 1 for -2<x< 4.
Hiii) Hence, solve the equation 2x2 - 4x – 1 = 0.
2. By drawing the graph of y = 7 – 4x - 3x2 for -3 < x < 2, solve the equation
7 - 4x – 3.x2 = 0 graphically.

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

The following frequency table relates the weekly sales of bicycles at a given store over a 42-week period. value01234567frequency367108521(a) in how many weeks were at least 2 bikes sold? (b) in how many weeks were at least 5 bikes sold? (c) in how many weeks were an even number of bikes sold?

Data from 2005 for various age groups show that for each $100 increase in the median weekly income for whites, the median weekly income of blacks increases by $105. also, for workers of ages 25 to 54 the median weekly income for whites was $676 and for blacks was $527. (a) let w represent the median weekly income for whites and b the median weekly income for blacks, and write the equation of the line that gives b as a linear function of w. b = (b) when the median weekly income for whites is $760, what does the equation in (a) predict for the median weekly income for blacks?