The problem gives you X, so replace X witht he given vaule and solve for y:
y = -0.1x^2 + 4X
X = 40
y = -0.1(40)^2 +4(40)
y = -0.1(1600) + 160
y = -160 + 160
y = 0
Answer:
X = 9
Step-by-step explanation:
I assume B, since you start with the sum of 16, then break it down and get "9+1=10, 10+6=16"
Since Katie entered the number 15 and it displayed 9 the machine in this case is doing whatever number you put in -6 so it displayed 9 again when 23 is entered 23-6 = 17 and that is what displayed and again for 100 and 94 so the machine is taking 6 off each time.
A, The machine is taking 6 off each time.
if you enter 77 and 6 was taken off it would be 71 so 71
B, 71
Area is 20.4 units , thank me later