6 books at $ 8 = (6 * 8) = 48
if he got a discount of 20%, then he paid 80%
0.80(48) = 38.40 <== what he paid
Answer:
The average rate of change is 8.
Step-by-step explanation:
The formula to calculate the average rate of change of a function F(x) is:
![\frac{F(b)-F(a)}{b-a}](https://tex.z-dn.net/?f=%5Cfrac%7BF%28b%29-F%28a%29%7D%7Bb-a%7D)
In this case, F(x) = ![0.5x^{2} +5x+9](https://tex.z-dn.net/?f=0.5x%5E%7B2%7D%20%2B5x%2B9)
a=2 and b=4
You have to evaluate x=2 (which is a in the formula) and x=4 (which is b in the formula) in the function.
In order to obtain F(b) and F(a) you have to replace x=4 and x=2 in the given function:
F(b) = ![(0.5)4^{2} + 5(4) +9= 37](https://tex.z-dn.net/?f=%280.5%294%5E%7B2%7D%20%2B%205%284%29%20%2B9%3D%2037)
F(a) = ![(0.5)2^{2} + 5(2)+9=21](https://tex.z-dn.net/?f=%280.5%292%5E%7B2%7D%20%2B%205%282%29%2B9%3D21)
![\frac{F(b)-F(a)}{b-a} = \frac{37-21}{4-2}=\frac{16}{2} = 8](https://tex.z-dn.net/?f=%5Cfrac%7BF%28b%29-F%28a%29%7D%7Bb-a%7D%20%3D%20%5Cfrac%7B37-21%7D%7B4-2%7D%3D%5Cfrac%7B16%7D%7B2%7D%20%3D%208)
The answer is 8.
There is no graph to figure this out...
Answer:
0.90
Step-by-step explanation:
090. = 0.90
30/2.80
28
00
Answer:
The following equation is not a circle, but a hyperbola, because you have 4y, but no y^2
Step-by-step explanation:
Please mark for Brainliest!! :D Thanks!!
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