The slope of the function is given by its derivative. You want to find the values of x such that the derivative is between -1 and 1.
... f'(x) = 0.4x +5
... -1 < 0.4x +5 < 1 . . . . . your requirement for slope
... -6 < 0.4x < -4 . . . . . . subtract 5
... -15 < x < -10 . . . . . . . multiply by 2.5
Any value of x that is between -15 and -10 will be one where the tangent line has a slope between -1 and 1.
_____
The graph shows tangent lines with slopes of -1 and +1. You can see that the slope of the graph of f(x) is between those values when x is between the tangent points.
Answer:
1 : 900
Step-by-step explanation:
18 m = 1800 cm
2:1800 reduced is 1:900
Which question I don't see pics
Let the original price be p.
Then the sale price was (1.00-0.18)p, or 0.82p.
Emerson must pay tax on this sale price. It is 0.08(0.82p) = 0.0656p.
Thus, the final cost of the game was 0.82p + 0.0656p = 0.886p.