Question

The function f(t) = -.24t^2 + 3.2t + 60 represents the solar energy consumption (in trillion BTU in the United States in the year that is t years since 1990. a) Find the f(21) and interpret its meaning. In year , the energy consumption was trillion BTU. b) Find the vertex and interpret its meaning. Enter the vertex as a point in the form "(h, k)" (no quotes). Round to two decimal places. The vertex is . In year , the solar energy consumption was at its Choose one of trillion BTU. c) In what year(s) is the solar energy consumption 61 trillion BTU. The energy consumption is 61 trillion BTU in year(s) . If there is more than one year, separate the years with a comma. If there are no years, enter "never". Round to the nearest year.

          The function f(t) = -.24t^2 + 3.2t + 60 represents the solar energy consumption (in trillion BTU in the United States in the year that is t years since 1990.
a) Find the f(21) and interpret its meaning.
In year , the energy consumption was trillion BTU.
b) Find the vertex and interpret its meaning. Enter the vertex as a point in the form "(h, k)" (no quotes). Round to two decimal places.
The vertex is . In year , the solar energy consumption was at its Choose one of trillion BTU.
c) In what year(s) is the solar energy consumption 61 trillion BTU.
The energy consumption is 61 trillion BTU in year(s) . If there is more than one year, separate the years with a comma. If there are no years, enter "never". Round to the nearest year.

The function f(t) = -.24t^2 + 3.2t + 60 represents the solar energy consumption (in trillion BTU in the United States in the year that is t years since 1990.
a) Find the f(21) and interpret its meaning.
In year , the energy consumption was trillion BTU.
b) Find the vertex and interpret its meaning. Enter the vertex as a point in the form "(h, k)" (no quotes). Round to two decimal places.
The vertex is . In year , the solar energy consumption was at its Choose one of trillion BTU.
c) In what year(s) is the solar energy consumption 61 trillion BTU.
The energy consumption is 61 trillion BTU in year(s) . If there is more than one year, separate the years with a comma. If there are no years, enter "never". Round to the nearest year.

Added by Montserrat L.

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