Answer:
(a) f⁻¹(x) = 2x - 8
(b) f⁻¹(4) = 0
Step-by-step explanation:
This is usually not too difficult if you write the equation as y = f(x), then swap x and y and solve for y.
... y = (1/2)x + 4 . . . . y = f(x)
... x = (1/2)y + 4 . . . . variables swapped
... x - 4 = (1/2)y . . . . . subtract 4
... 2(x -4) = y . . . . . . multiply by 2
... y = 2x - 8 . . . . . . simplify
... f⁻¹(x) = 2x -8
____
Evaluating this for x=4, we get
... f⁻¹(4) = 2·4 - 8 = 0
We cant answer the question without the diagram.
Given the equation y = kx
Also given that she:
earned $350 after working 40 hours
y = how much earned
x = number of hours
Plug it in
y = kx
350 = k(40)
divide both sides by 40 to find out how much k is
8.75 = k
k = 8.75 so your answer is A.) 8.75
Hope this helps :)
Answer:
44.5
Step-by-step explanation:
area of rectangle : w*l=3*9=27
area trianle= (height*base)/2= (5*7)/2=35/2=17.5
27+17.5=44.5
