Draw a tangent to the graph of y=f(x) at the point where x= 1. Use
your tangent to estimate the gradient of y=f(x) when x=1.

4 packs of water and 7 packs of candy bars

step-by-step explanation:

35x4=140

140/20=7

the formula of a slope:

from a table we have

substitute:

the slope of f(x) is -1.

the graph of funcfion g(x) is a horizontal line. the slope of a horizontal line is equal 0. therefore the slope of g(x) is 0.

-1 < 0