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The cost, in dollars, to produce 1 watt of solar energy is
a function of the number of years since 1977, t.
From 1977 to 1987, the cost could be modeled by an
exponential function f. Here is the graph of the
function.
What is f (3.5)? What does it represent?

Respuesta :

In the figure attached, the graph of the function is shown.

1. f(9) ≈ 6 means that at t = 9 (year 1977 + 9 = 1986) the cost to produce 1 watt of solar energy was $6

2. f(4) ≈ 25, which means in the year 1981 (=1977 + 4) the cost was $25 per watt  

f(3.5) ≈ 28, which means at half of the year 1980 (=1977 + 3.5) the cost was $28 per watt  

3. When f(t) = 45, t is equal to 2, which means that the year was 1979 (= 1977 + 2)

4. From the graph we can compute the following table:

x  |  y

0  |  80

1   |  60

What is the general exponential decay formula?

f(x) = a*b^x

where a is the initial value and b is the decay factor.

Replacing with data from the table:

f(0) = a*b^0

80  = a

f(1) = a*b^1

60/80 = b

0.75 = b

To learn more about exponential function visit:

https://brainly.com/question/2456547

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