Mrs.Bennett has graded 20% of her 150 students papers. How many papers does she still need to finish?
2 answers:
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The exponential function which represented by the values in the table is ⇒ 3rd answer
Step-by-step explanation:
The form of the exponential function is , where
- a is the initial value (when x = 0)
- b is the growth/decay factor
- If k > 1, then it is a growth factor
- If 0 < k < 1, then it is a decay factor
The table:
→ x : f(x)
→ -2 : 16
→ -1 : 8
→ 0 : 4
→ 1 : 2
→ 2 : 1
∵
- To find the exponential function substitute the value of x and f(x)
by some values from the table to find a and b, at first use the
point (0 , 4) to find the value of a
∵ x = 0 and f(x) = 4
∴
- Remember that any number to the power of zero equal 1
except the zero
∵
∴ 4 = a(1)
∴ a = 4
Substitute the value of a in the equation
∴
- Chose any other point fro the table to find b, lets take (1 , 2)
∵ x = 1 and f(x) = 2
∴
∴ 2 = 4 b
- Divide both sides by 4
∴
- Substitute the value of b in the equation
∴
The exponential function which represented by the values in the table is
Learn more:
You can learn more about the logarithmic functions in brainly.com/question/11921476
#LearnwithBrainly
Answer:
$0.21
Step-by-step explanation:
We can set up a proportion. Say x is the cost of 1 wristband:
Now, we cross multiply:
25x = 5.25
Solving for x, we see that x = 0.21.
Thus, the answer is $0.21.