B and D because there are the reverse of 67 + 38 = 105.
Hope that helps :)
Replace x with 3:
f(x) = 20(0.5)^x
f(3) = 20(0.5)^3
First do 0.5^3 = 0.125
Now multiply that by 20:
20 x 0.125 = 2.5
f(3) = 2.5
Answer:
x - 33 < 8
x < 8 + 33
x < 41
x= {40, 39, 38, . . . }
